Location on PO Receipts

Hi All,

We have PO's with expenses (Item Description = Description of the expense). The receipt routing on these is set to 'Direct Delivery'. When the receivers receipt these expense PO's, the destination type defaults to 'Expense', but the location is blank and mandatory. Can someone tell me how can i default the location? Why is the location mandatory for expense POs? I understand Oracle asking for a location or subinventory/locator for inventory POs when the routing is 'Direct Deliver', but why for expense POs? Is this a bug? 

PS: I know if i set the 'Deliver To' on the PO distribution, then it will default at the time of receipt. But buyers don't want to enter them on legacy migrated POs.