SAP Message VFRR042 - Source &1 &2 is service-related but target &3 &4 is not

Diagnosis
The source is a service-related revenue recogntion item but the targetis a time-related revenue recognition item. In service-related revenuerecognition, the system uses the the services rendered, not the sourceitem, to determine the revenues that should be recognized. Normally anitem in the release order or in a delivery determines the revenue to berecognized.

System Response
This message is for information purposes only. For revenue recognition,the items are processed completely separately from each other. Thismeans that the target item is treated as a time-related revenuerecognition item independent of the source item. Determining factorsare the value and defined periods of the target item. All other itemsdo not influence the revenue recognition process.

Procedure
Check your copying control settings in Customizing for the source tothe target document. Ensure that the required revenue recognitionprocess works correctly for both items. In other words:
Have the document types and item categories been correctly maintained?
Have the correct revenue recognition categories been assigned to theitem categories?