Workflow binding problem instanciated business object

[TimS82]

Hi experts,

currently I am struggling on the following problem:
I wanted to add an instance of purchase requisition as an adhoc_object in user decision workitem.
But the instance is either not passed back correctly, or I am doing something wrong by passing it to the adhoc_object.

I want to instanciate the business object 2105 within my workflow.
So I used standard task TS01200205:
1) Created a wf container element of business object 2105 (import & export) named "BUS2105"
2)  Binding:

 

3) Result is ok, after processing WF:

4) Next one is a user decision:

 

Any ideas would be highly appreciated.

Kind regards
Tim