Github user haouech commented on a diff in the pull request:

    
https://github.com/apache/incubator-taverna-language/pull/41#discussion_r208043243
  
    --- Diff: 
taverna-scufl2-api/src/main/java/org/apache/taverna/scufl2/api/common/Scufl2Tools.java
 ---
    @@ -752,6 +753,30 @@ public Activity createActivityFromProcessor(Processor 
processor,
                return activity;
        }
     
    +   public Configuration createNestedRelationship(Processor processor, 
Workflow childWorkflow, Profile profile) {
    +           if(processor.getParent() == null) {
    +                   throw new IllegalStateException("Processor " + 
processor + " has no parent");
    +           }
    +           if(processor.getParent().getParent() != 
childWorkflow.getParent()) {
    +                   throw new IllegalStateException(
    +                                   "Processor " + processor + " and 
workflow " + childWorkflow + " are not in the same Workflow bundle");
    +           }
    +           if(nestedWorkflowForProcessor(processor, profile) != null) {
    --- End diff --
    
    I see your point. I took advantage of the already thrown exceptions by the 
'getActivity' method of Processor. Now we make sure that the processor has no 
activity bound to it before nesting the workflows.


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