Customizing error in period work schedule &1 &2 &3

What causes this issue?

There are no valid system entries for the displayed period work
schedule. This is a customizing error. Possible causes are
inconsistencies in tables T508A, T508Z, T550A, T550P, T551A, T551C, and
T553A, or work schedules that have not been generated.

System Response

Processing of the time data is cancelled.

How to fix this error?

The error message parameters are sorted as follows:
Personnel subarea grouping for daily work schedules
Period work schedule
Week number

Error message extract from SAP system. Copyright SAP SE.