Purchase Order Miscellaneous Charges

We want to create a po for an inventory item and the PO will be set up to flow to inventory when received.  We want to add a standard cost to the purchase order that might be a calculated amount including freight, handling, etc.  This standard load will not be on the invoice when received by the vendor. 

Is anyone aware of a way to add a standard cost load for an item to the PO that will flow through as an additional cost for the inventory item, that will not flow through to AP and cause a matching error?  Miscellaneous charges do not work as they will cause a matching error as they flow through.