# OpcClient.DeleteReference Method

> Reference: Deletes a reference of existing nodes in the address space hierarchy using the command specified.

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">OpcClient</a></dd>
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.client">Opc.UaFx.Client</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Members</dt>
<dd><a href="./members">OpcClient Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

<span class="api-meta">5 overloads</span>

| Overload | Description |
|---|---|
| [DeleteReference(OpcDeleteReference)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/deletereference#deletereference-opc-uafx-opcdeletereference)<span class="api-meta">since v2.7</span> | Deletes a reference of existing nodes in the address space hierarchy using the `command` specified. |
| [DeleteReference(OpcNodeId, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/deletereference#deletereference-opc-uafx-opcnodeid-opc-uafx-opcnodeid) | Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other. |
| [DeleteReference(OpcNodeId, OpcNodeId, OpcReferenceDirection?)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/deletereference#deletereference-opc-uafx-opcnodeid-opc-uafx-opcnodeid-system-nullable-of-opc-uafx-opcreferencedirection) | Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other using the `direction` specified. |
| [DeleteReference(OpcNodeId, OpcNodeId, OpcReferenceDirection?, OpcReferenceType)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/deletereference#deletereference-opc-uafx-opcnodeid-opc-uafx-opcnodeid-system-nullable-of-opc-uafx-opcreferencedirection-opc-uafx-opcreferencetype) | Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other using the `direction` specified. |
| [DeleteReference(OpcNodeId, OpcNodeId, OpcReferenceDirection?, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/deletereference#deletereference-opc-uafx-opcnodeid-opc-uafx-opcnodeid-system-nullable-of-opc-uafx-opcreferencedirection-opc-uafx-opcnodeid)<span class="api-meta">since v2.7</span> | Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other using the `direction` specified. |

**Exceptions (all overloads)**

| Exception | Condition |
|---|---|
| [ObjectDisposedException](https://learn.microsoft.com/dotnet/api/system.objectdisposedexception) | The object has been disposed of. |
| [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The service execution failed upon different circumstances; for more details see exception details. The following issues can lead to that exception: [BadNothingToDo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnothingtodo) and [BadTooManyOperations](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtoomanyoperations). |

## DeleteReference(OpcDeleteReference)

<span class="api-meta">since v2.7</span>

Deletes a reference of existing nodes in the address space hierarchy using the `command` specified.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcStatus DeleteReference(OpcDeleteReference command)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function DeleteReference(command As OpcDeleteReference) As OpcStatus
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `command` | [OpcDeleteReference](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdeletereference/) | The [OpcDeleteReference](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdeletereference/) instance to process. |

**Returns**

[OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/)

An instance of the [OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/) class which contains the information about the outcome of the processed command.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `command` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The add node service is currently not supported, especially using the `command` specified. |

**Remarks**

Known results for the `command` specified are:

| Status | Description |
|---|---|
| [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid) | For more details see [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid). |
| [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid) | For more details see [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid). |
| [BadServerIndexInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badserverindexinvalid) | The server index is not valid. |
| [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid) | For more details see [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid). |
| [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied) | For more details see [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied). |
| [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights) | For more details see [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights). |

## DeleteReference(OpcNodeId, OpcNodeId)

Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other. The relation is deleted in bidirectional direction using [Organizes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencetype/#organizes) as the type of reference.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcStatus DeleteReference(OpcNodeId nodeId, OpcNodeId targetNodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function DeleteReference(
    nodeId As OpcNodeId,
    targetNodeId As OpcNodeId) As OpcStatus
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the source node can be identified and accessed. |
| `targetNodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the target node can be identified and accessed. |

**Returns**

[OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` or `targetNodeId` is equals [Null](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#null). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` or `targetNodeId` is a null reference (Nothing in Visual Basic). |

**Remarks**

Known results for the service invocation are:

| Status | Description |
|---|---|
| [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid) | For more details see [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid). |
| [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid) | For more details see [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid). |
| [BadServerIndexInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badserverindexinvalid) | The server index is not valid. |
| [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid) | For more details see [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid). |
| [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied) | For more details see [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied). |
| [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights) | For more details see [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights). |

## DeleteReference(OpcNodeId, OpcNodeId, OpcReferenceDirection?)

Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other using the `direction` specified. The reference to delete have to be of the relation defined by `direction` using the [Organizes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencetype/#organizes) as the type of reference.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcStatus DeleteReference(
    OpcNodeId nodeId,
    OpcNodeId targetNodeId,
    OpcReferenceDirection? direction)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function DeleteReference(
    nodeId As OpcNodeId,
    targetNodeId As OpcNodeId,
    direction As OpcReferenceDirection?) As OpcStatus
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the source node can be identified and accessed. |
| `targetNodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the target node can be identified and accessed. |
| `direction` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)&lt;[OpcReferenceDirection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedirection/)&gt; | One of the members defined by the [OpcReferenceDirection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedirection/) enumeration which defines the kind of relation of reference to delete or a null reference (Nothing in Visual Basic) in case there the relation is to be deleted in bidirectional direction. |

**Returns**

[OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` or `targetNodeId` is equals [Null](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#null). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` or `targetNodeId` is a null reference (Nothing in Visual Basic). |

**Remarks**

Known results for the service invocation are:

| Status | Description |
|---|---|
| [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid) | For more details see [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid). |
| [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid) | For more details see [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid). |
| [BadServerIndexInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badserverindexinvalid) | The server index is not valid. |
| [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid) | For more details see [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid). |
| [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied) | For more details see [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied). |
| [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights) | For more details see [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights). |

## DeleteReference(OpcNodeId, OpcNodeId, OpcReferenceDirection?, OpcReferenceType)

Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other using the `direction` specified. The reference to delete have to be of the relation defined by `direction` using the `referenceType` specified as the type of reference.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcStatus DeleteReference(
    OpcNodeId nodeId,
    OpcNodeId targetNodeId,
    OpcReferenceDirection? direction,
    OpcReferenceType referenceType)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function DeleteReference(
    nodeId As OpcNodeId,
    targetNodeId As OpcNodeId,
    direction As OpcReferenceDirection?,
    referenceType As OpcReferenceType) As OpcStatus
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the source node can be identified and accessed. |
| `targetNodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the target node can be identified and accessed. |
| `direction` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)&lt;[OpcReferenceDirection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedirection/)&gt; | One of the members defined by the [OpcReferenceDirection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedirection/) enumeration which defines the kind of relation of reference to delete or a null reference (Nothing in Visual Basic) in case there the relation is to be deleted in bidirectional direction. |
| `referenceType` | [OpcReferenceType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencetype/) | One of the members defined by the [OpcReferenceType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencetype/) enumeration to use to setup the reference between the source and the target node identified by the `nodeId` and the `targetNodeId`. |

**Returns**

[OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` or `targetNodeId` is equals [Null](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#null). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` or `targetNodeId` is a null reference (Nothing in Visual Basic). |

**Remarks**

Known results for the service invocation are:

| Status | Description |
|---|---|
| [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid) | For more details see [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid). |
| [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid) | For more details see [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid). |
| [BadServerIndexInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badserverindexinvalid) | The server index is not valid. |
| [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid) | For more details see [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid). |
| [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied) | For more details see [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied). |
| [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights) | For more details see [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights). |

## DeleteReference(OpcNodeId, OpcNodeId, OpcReferenceDirection?, OpcNodeId)

<span class="api-meta">since v2.7</span>

Deletes one or more references of existing nodes in the address space hierarchy using the identifiers of the nodes which shall not longer reference each other using the `direction` specified. The reference to delete have to be of the relation defined by `direction` using the type of reference identified by the `referenceTypeId` specified.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcStatus DeleteReference(
    OpcNodeId nodeId,
    OpcNodeId targetNodeId,
    OpcReferenceDirection? direction,
    OpcNodeId referenceTypeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function DeleteReference(
    nodeId As OpcNodeId,
    targetNodeId As OpcNodeId,
    direction As OpcReferenceDirection?,
    referenceTypeId As OpcNodeId) As OpcStatus
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the source node can be identified and accessed. |
| `targetNodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) through that the target node can be identified and accessed. |
| `direction` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)&lt;[OpcReferenceDirection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedirection/)&gt; | One of the members defined by the [OpcReferenceDirection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedirection/) enumeration which defines the kind of relation of reference to delete or a null reference (Nothing in Visual Basic) in case there the relation is to be deleted in bidirectional direction. |
| `referenceTypeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) which identifies the type of reference to use to setup the reference between the source and the target node identified by the `nodeId` and the `targetNodeId`. |

**Returns**

[OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId`, `targetNodeId` or `referenceTypeId` is equals [Null](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#null). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId`, `targetNodeId` or `referenceTypeId` is a null reference (Nothing in Visual Basic). |

**Remarks**

Known results for the service invocation are:

| Status | Description |
|---|---|
| [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid) | For more details see [BadSourceNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsourcenodeidinvalid). |
| [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid) | For more details see [BadReferenceTypeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badreferencetypeidinvalid). |
| [BadServerIndexInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badserverindexinvalid) | The server index is not valid. |
| [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid) | For more details see [BadTargetNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtargetnodeidinvalid). |
| [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied) | For more details see [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied). |
| [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights) | For more details see [BadNoDeleteRights](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeleterights). |