SAP Message TU515 - Cannot create payment plan for contract &2 of contract account &1

Diagnosis You wanted to create a new payment plan for contract &V2& (contractaccount &V1&) during invoicing. Due to the historical billing data for contract &V2&, the amount perdue date for the payment plan to be created was zero. System Response The system could not create a new payment plan for contract &V2&. Deleting the start month (&V3&) from the contract data, removed contract &V2& from payment plan processing.