SAP Message RSM2721 - No semantic key fields selected despite serialization

Diagnosis
The existing DTP requires a serialized update because fields are updatednon-commutatively during the processing run (for example, MOVE).
You have not selected a field as the semantic key in the error handling.Therefore the system cannot perform error handling.

System Response
As the system terminates requests of this type as soon as incorrectrecords are found anyway (even if records were incorrect in previousrequests), the system terminates the generation of the DTP.

Procedure
Select at least one field in the Semantic Groups dialogbox.