Hi Klaus thanks for posting! Is this one of the transclusion macros native to Confluence (i.e. the "excerpt include" macro  "excerpt" macro or "include page" macro)? Or is it a transclusion macro from a Confluence add-on? We can't guarantee that our add-on is compatible with all other add-ons so that's likely the issue. I'd recommend using one of the native Confluence macros if you are looking to insert content from other pages. I apologize for any inconvenience this causes and please let me know if you have further questions!

Hi Maiuson

thanks for the quick answer.
The Transclusion Macro seems to be a add-on in our environment. It works fine with the "excerpt" macro you named. Thanks a lot!