SAP Message V1093 - Processing release types cannot be changed from &1 to &2

Diagnosis
Since the schedule line category of thisschedule line is not assigned to an purchase order type, so no purchaserequisition is possible for the schedule line.

Procedure
To allow purchase requisitions for a schedule line, this must bedefined in the purchase order type for the appropriate schedule linecategory.
DEFINE &ANLEGEOBJEKT& = 'schedule line categories'
INCLUDE 'NA_CREATE_CHANGE' OBJECT DOKU ID TX LANGUAGE EN