Hello Wolfgang,
Check my below blogs:
Condition Master Data - Customizing Download
Condition Master Data Download
I have mentioned some of commonly faced issues and things to be taken care during condition/listings download.
Are you getting CNDMAP2 50 error message?
This error message says 'Records of table &1, usage &2 cannot be exchanged'.
So I suspect filter setting for donwload object here.
If you can share more information about the scenario, I can help you further.
Regards,
Shanthala.