FM area &1 is not assigned to day-end closing

What causes this issue?

Every FM area must be assigned to a closing group (day-end closing). In
the system this assignment was not found for the FM area processed.

System Response

The payment accrual cannot take place.

How to fix this error?

Please check the assignment of FM area &V1& to a closing group in IMG
activity <DS:SIMG._ISPSDE_FMZT>Assign Posting Day to Company Code/ FM
Area</>. Define a corresponding assignment here.

Error message extract from SAP system. Copyright SAP SE.