The passed reconciliation indicator is not correct (only A, R or U).

What causes this issue?

You passed in a wrong reconciliation indicator. The following values
are allowed:
A - All reconciliation records: reconciled & unreconciled records.
R - Only reconciled records: The reconciliation was already executed.
U - Only unreconciled records: The reconciliation wasn't executed yet.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.