SAP Message WS105 - Calendar & insufficiently maintained (Please maintain)

Diagnosis
The system tried to read a date for the value date of the paymentdocument from calenar &V1&. However, calendar &V1& does not contain anyadditional flagged dates.

System Response
The function cannot be executed.

Procedure
Maintain calendar &V1& so that the dates required are available. Ifnecessary, contact your R/3 system administrator.