Webi Problems with Bex Query Customer Exit

Hi everyone,

i am trying to run a Bex query on Webi. If i run the query via Bex Analyzer everything wents fine, but using the Webi i get following answer.

The case is that the query i am using does have a customer exit.

I have put that in a structure, where i try to do a YTD for the results of previous 13 Weeks of Calendar Week.

I do not understand why this is not running in Webi.

Plz help