SAP Message UCS0209 - Tasks &1 and &2 have the same document type &3

Diagnosis
Document type &V3& is assigned to tasks &V1& and &V2& (and possiblyother tasks). However, each task must have its own document type.
Note:
An exception is made for the reconciliation task. The same documenttype may be assigned to both a reconciliation task as well as a taskfor interunit elimination.

Procedure
Assign a different document type to each task.