SAP Message >0070 - Reconciliation key &1 is reserved for &2 &3

Diagnosis
Reconciliation key &V1& is already in use elsewhere.

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

Procedure
Online:
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