Unable to freeze the reconciliation once it is completed

Summary:

I am not able to freeze or grey out the reconciliation once it is completed in entirety. It does give me an option to mark it as Reviewed, however i can still unmark it at any point in time. Also, after unmarking, i can still take a back step and mark my statement and system lines as unreconciled.

I want to lock my reconciliation once it is completed for 1 particular statement.

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