Designer eliminates exception mapping declarations

[donkon]

We use Flowable Exception Mapping declarations und add them manually per XML-Editor to the bpmn, e.g.

<extensionElements> <activiti:mapException errorCode="myErrorCode1">org.activiti.SomeException</activiti:mapException>

When opening the BPMN with the Flowable Designer and by changing/saving something, the exception mapping declarations are gone.

Is there any way to get around this? Will there be Exception Mapping Support in the Designer