SAP Message CACSSESTD031 - Error while extracting a new settlement schedule no. from number range &1

Diagnosis To post a new settlement schedule in the database, a number is requiredfrom the number range of the number range object CACS_SES. A numberrange interval must be reserved for the processing first. In this case,number range &SYST-MSGV1& was reserved. An error occurred in thesubsequent attempt to take a number from the number range &SYST-MSGV1&.Since the settlement schedule number is part of the key, a posting isnot possible. System Response Processing stops. Procedure Check the following: Is range &SYST-MSGV1& a valid number range interval for object CACS_SES? Is the internal number assignment set for the number rangeinterval? Does the interval have any free numbers?