End dated account Code still flows from AP Module to GL

Hi

We have end dated a Natural Account code

there are certain old PO’s with above end dated charge account.

When user is entering the AP Invoice with above charge account the same gets validated, accounted and posted to GL without any issue although it should get struck in AP Itself

Can some let me know the reason for this getting flown to GL without any issue actually the same should be struck in AP Itself?

Rgds

Ramesh