SAP Message AJ535 - Incorrect call of adjustment reversal f. cust. change in 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 customer 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.