SAP Message V1716 - Working hours &1 for factory calendar &2 are invalid

Diagnosis
The system has found an invalid, or unavailable work time indicatorduring delivery and transportation scheduling. The work time is &V1& infactory calendar &V2&.
The work times and/or factory calendars were probably deleted inCustomizing, even though they would still be referred to.

System Response
Scheduling is terminated, all deadlines are set to the start date ofthe scheduling.

Procedure
Ensure that the work times &V1& for factory calendar &V2& aremaintained in table TTSTRSD.