Hello Birgit,
Is the error is like the screen shot below :
If your starting the application and at that time it is throwing a DUMP then the possible reason is that somewhere in the PPOMA in your Org Structure you have entered the Logical system wrongly.
Please check each and every node for the attributes Company code, and Others where ever your maintaining Logical system.
Hope this may help you resolve.
Thanks
From RBEI,
Snehal
