0FI_GL_20 Extractor - Delta fails

I have just activated the business content for the 0FI_GL_20 Extractor in EhP3 (Reporting Financials).

I have done 2 infopackages, one for the init and one for the delta.

The init seems to work fine, but when I execute the delta infopackage I get "Errors in source system. Err msg RSM340".

I can do a full load without any problems.

Any ideas what might be wrong?

There is no DSO included for this flow in the business content. Dont I need this for the delta logic to work in the infocube?