Maybe this link will help you to narrow down the root cause.
As a side note: by choosing to post in a different language than English (especially in a thread header) you just limit the number of possible replies....
Lutz
A pessimist is an optimist with experience. How to get fast answers to your question[/url]
How to post performance related questions[/url]
Links for Tally Table [/url] , Cross Tabs [/url] and Dynamic Cross Tabs [/url], Delimited Split Function[/url]