SAP Message >0071 - Reconciliation key &1 already used elsewhere

Diagnosis
Reconciliation key &V1& is already in use. However, for the processingyou require here, you require a reconciliation key that cannot be usedfor other postings.

System Response
Online processing:
Error message requiring correction.
Background processing:
Error message and termination of processing.

Procedure
Online processing:
Enter a different reconciliation key
Background processing:
INCLUDE NA_SYSADMIN1 OBJECT DOKU ID TX

Procedure for System Administration
INCLUDE FICA_NA_OSS OBJECT DOKU ID TX