Ability to put nominal codes on hold if they are no longer to be used

To limit use of nominal code/CC/depts., there seems to be an ability to make inactive and disallow manual journal entries. However supplier transaction imports can still be posted to nominal code/CC/dept. combinations even if they are made inactive (and manual journal entries disallowed). The ability to put nominal code/CC/depts. on hold completely and to stop use of them altogether regardless of the source of the transaction would be extremely useful.