Hi @Tobias Strobel ,
According to the error message, please try to process the related dimension see if it can be resolved.
"Error retrieving children: The '$Ergebnisbereich' object was not found", basically means the related dimension has been updated but has not been processed.
So please try to process the related dimension see if it can be resolved. If it still failed, then I would suggest to do processing full for the SSAS project.
Regards,
Zoe
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