Hi Edi
It seems that the characteristic field KUNWE is not available in QAS system. Even though you delete it in DEV now and transport the changes to QAS, you will still end up with the same issue because that is included in your data source design.
I would suggest you re-transport your operating concern to QAS using KE3I. Alternatively, you can exclude KUNWE field from your datasource, if appropriate.
For restructuring the datasource, check the link
http://scn.sap.com/docs/DOC-44391
Check if this helps
Regards
Mustafa
PS: My humble request to you to please not reward me any points, because I and similar like minded gurus are not lured by the carrot, just like the way you proposed.