Hi Petra
Please mark this thread with a Correct Answer and Helpful Answer where appropriate.
See http://scn.sap.com/community/support/blog/2013/04/03/how-to-close-a-discussion-and-why
Even if you discovered the solution without any outside contributions, it helps others to understand what the solution turned out to be.
Best regards
Eduardo Chagas
[SCN Moderator]