Diagnosis
You want to generate a request with data transfer process &v1&. However,this DTP cannot currently be executed. Possible reasons for this are:
The source or target object have been changed in a way that isincompatible to the DTP. For example, a field that is in the key of theerror stack or selection list has been deleted from the source.
The source or target object, or the transformation, has been deleted.

Procedure
Call DTP maintenance and check the DTP. Where necessary, correct theerror and activate the DTP.