SAP Message >0369 - Internal error: Lock missing for change / clear document item

Diagnosis You tried to clear or change an open item for business partner &V1& andcontract account &V2& in company code &V3&. This is only permitted ifbusiness partner and contract account are locked for other processing.The corresponding locks do not exist in the case in question. System Response Error message. The posting or the document change is not executed. Procedure As this is a program error, you must cancel processing. In massprocessing, processing of the current transaction is automaticallycanceled. INCLUDE NA_SYSADMIN1 OBJECT DOKU ID TX Procedure for System Administration INCLUDE FICA_NA_OSS OBJECT DOKU ID TX One of the possible reasons for the error during clearing might be thatthe affected line item was not read by the correct function modules : FKK_OPEN_ITEM_SELECT FKK_OPEN_ITEM_MASS_SELECT_GET