SAP Message RU079 - Record type & is not assigned to an activity

Diagnosis
When you maintain the costing data for a work center, you can assign arecord type class to each activity. The confirmation entered usingrecord type &V1& belongs to the record type class &V2&. However, thisrecord type class is not defined in work center &V3&.

Procedure
Check the record type classes in your work centers.