SAP Message CACSELT013 - Technical error; no structures for settlement scheduling exist

Diagnosis
You have selected settlement scheduling (package CACS25), however therequired data structures are not active in the system. Consequently nodata references to these types can be created or runtime information forthese types obtained.

System Response
This is a serious error that prevents further execution. Processing isterminated.

Procedure
This error may occur if you have selected package CACS25 but theapplication has not been successfully generated.
Generate the application again and check the generation log.