When a SwitchYard service is added to a BPM process and configured then JBDS emits one or more of this errors

Expression and Language must not be blank	ProcessComponent.bpmn	/implementations-component-test/build/classes	Unknown	BPMN 2.0 Modeler

The process is runnable even with this errors, but project is marked as build error.

The problem lies with data associations related to the task

This is an exmaple fo a XML that is generated for setting service name to "MyService" 

      <bpmn2:dataInputAssociation id="_DataInputAssociation_2">
        <bpmn2:targetRef>_DataInput_2</bpmn2:targetRef>
        <bpmn2:assignment id="Assignment_2">
          <bpmn2:from xsi:type="bpmn2:tFormalExpression" id="FormalExpression_5" >MyService</bpmn2:from>
          <bpmn2:to xsi:type="bpmn2:tFormalExpression" id="FormalExpression_6" >_DataInput_2</bpmn2:to>
        </bpmn2:assignment>
      </bpmn2:dataInputAssociation>

If an attribute language="http://www.mvel.org/2.0" is added to from and to elements then one of the error is eliminated. All errors are eliminated if all data associations has the same change.