SAP Message >R029 - Billing doc &1 - line item &3 - &4 in open item &2 does not exist

Diagnosis
System error when offsetting/clearing the down payment againstthe receivable.
Unable to read a line item of open item &V2& in Contract A/R & A/P
No item found for the following keys
Document &V2&
Item &V3&
Sub-item &V4&
( SD billing doc &V1& )

Procedure
INCLUDE FICA_NA_INFOADMIN!! OBJECT DOKU ID TX

Procedure for System Administration
INCLUDE FICA_NA_OSS_1 OBJECT DOKU ID TX