Hi Somil,
thanks for your reply.
I am aware of these elements. They are not contained in the source file.
When removing the mapping rules so all items are forwarded to target the processing of the same source file is fine.
So the error only occurs if due to the rules no item is to be forward to the target, but as occurrency is defined as 0..n for me this is valid use case.
Any thoughts on that?
best regards
Jochen