Include Restock Fee in (manually keyed) PO-matched AP Debit Memo?

Hi - Looking for the best practice / method to reflect deducting the amount of a Vendor Restock fee from the gross (negative) amount of a handkeyed, PO-matched AP Debit Memo, following a return of goods from customer to Vendor.

Currently we add a Line to the Debit Memo entry, "Misc" Type, enter the (positive) amount of Fee, then input a GL coding (to have that fee amount hit the desired GL account.)  However, sometimes that GL account doesn't trickle down to the Distribution, or the user forgets to input it, and then the "Misc" line will naturally default to hitting our Inventory GL acct. instead.