SAP Message >R034 - Open item &1 in Contract A/R & A/P not found

Diagnosis System error when offsetting the down payments received againstthe receivable. Unable to read the open item with document number &v1&. The documentcould not be found in Contract A/R &A/P. Procedure INCLUDE FICA_NA_INFOADMIN!! OBJECT DOKU ID TX Procedure for System Administration INCLUDE FICA_NA_OSS_1 OBJECT DOKU ID TX