Calendar & no longer maintained in system

What causes this issue?

The system attempted to read from calendar &V1& a further date for the
end of the validity period of a rebate arrangement or a period
condition. However, the calendar contained no further date, that is, the
calendar is no longer maintained in the system.

System Response

The requested action (create or extend arrangement etc.) cannot be
performed.

How to fix this error?

Maintain calendar &V1& sufficiently and perform the action again. If
necessary, inform your system administrator.
<DS:SIMG.SIMG_CFMENUOLMESFT3>Maintain calendar for rebate arrangements
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Error message extract from SAP system. Copyright SAP SE.