SAP Message TU504 - Cannot create payment plan because payment plan &1 already exists

Diagnosis You have tried to create a payment plan with start date &V3& forcontract &V2&. Payment plan &V1& already exists for this contract whose end date &V4&is after the start date of the plan to be created. System Response INCLUDE ISU_VERARB OBJECT DOKU ID TX Procedure Change the start date of the payment plan to be created.