Inconsistent data records removed from the BC Set

What causes this issue?

The BC Set contained data records for tables which are either:
no longer in the system,
flagged in an exclusion table, and not accepted in a BC Set.
redundant (duplicate) data records do not cause loss of information.

System Response

These data records have been deleted from the BC Set

How to fix this error?

Save the BC Set to record the changes.
You can see details of this message in the "BC Set Consistency check",
in display mode in the BC Set maintenance transaction. In change mode,
the data records are removed automatically. You can then no longer
dieplay detailed information.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.