Actual Cost Component is inconsistent. See long text

What causes this issue?

The differences determined by the actual cost component split, and the
differences from the material ledger are not the same. This may have
occurred due to a program error.

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?

a) If time is critical for your posting, you can ignore this warning.
The differences are then split using the standard cost component split
for price of the material concerned.
You can also deactivate this warning user-specific, by choosing
,,System -> User Profile -> Own Data, going to the Parameter tab and
entering the value ADJUST for parameter CKMLCSS_ADJUST.
b) If time is not critical to your posting, SAP recommends you to
terminate the transaction.
In both cases you should create a CSS Message to SAP with the following
entries:
,,Component:,,CO-PC-ACT
,,Priority:,,,,high
,,Short text:,,,,Error MLCCS 100,,
,,In the description, enter the transaction that lead to the error.
,,
You can permanently deactivate the message by maintaining an entry with
KKEY=MLCCS_100 and KDATA=N in table CKMLMVADMIN.
You can have the message always displayed as an error message (the
transaction cannot then be updated), by maintaining an entry with
KKEY=MLCCS_100 and KDATA=E in table CKMLMVADMIN.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.