SAP Message AJ537 - Incorrect call of adjustment reversal for contract change for doc. no. &1

Diagnosis An internal error has occurred. Function module ISU_BILL_CANCELLATION (INTERNAL: billing reversal) isto be used to execute an adjustment reversal for a contract change forbilling document &V1&. This is only possible if the interface parameter X_SPCANC is alsoselected. Function module ISU_BILL_CANCELLATION has been called up incorrectly.