Program throws error message on program exit due to MQTT and OPC UA mapping to same netPROXY source

Requirement concerned:

As a User, I want the Communication Studio/IoT-Plugin to handle mappings from MQTT and OPC UA to the same netPROXY Object element without causing errors, so that I can efficiently close the application without encountering issues.

Description:

An error is occurring in the Communication Studio/IoT-Plugin when attempting to map MQTT and OPC UA to the same netPROXY Object element. This issue is evident when using the projects "Example_OPCUA_MQTT_functional" and "Example_OPCUA_MQTT_broken". Specifically, the error manifests upon closing the application after adding a second mapping for "Actuator->Instance 0->Value" to a suitable OPC UA variable node. For further details, refer to the attached screenshot and project files.

Steps to reproduce:

1. Open the project "Example_OPCUA_MQTT_functional".
2. Navigate to netPROXY -> Objects and Mapping.
3. Add a second mapping for "Actuator->Instance 0->Value" and define a mapping to a suitable OPC UA variable node.
4. Save the project and close the program.
5. Observe the error message that appears during the closure process (refer to the attached screenshot).