Overhead on Item card

Hi, Does anyone what is the best way to switch overhead rate on item card? This is Navision 4.0 with average cost. There are Overhead cost defined the item card, now they want to delete all the overhead on the item cards and recapture them periodically by GL entries. It is easily to delete the overhead on the item card, but how to get correct material average cost on the item card so that the inventory valuation report is the same. After the switch, Average cost on item card should be = Current average cost – current Overhead rate = Average Material cost I looked at the Rolled-up Material cost column on the item card and that number did not make sense. Thanks,

How would you record the “overhead G/L entries” per item ?