Changing items from Inventory Asset and Cost Enabled to "expense"

 Hi,

I working with a client on their item master cleanup.  I have found that 99% of their items have Inventory Asset and Cost Enabled flags checked, but about 50% of these items are considered "expense" items.  I've done some research on these items and have found that some of these items have costed inventory transactions, such as PO receipt, subinventory transfer, etc.  I know you can disable the Inventory Asset and Cost Enabled flags as long as there is no on-hand inventory, but has anyone done this when there is a history of costed inventory transactions?  If so, were there any problems