How to Raise Purchase Order for receiving in multiple Inventory Organizations

A purchasing Operating Unit is mapped to two Inventory Organizations (through the same Ledger and Legal Entity) as follows:

(We are using R12.1)

                                                                 ------> Inventory Org 1

Operating Unit <------ Ledger------->Legal Entity

                                                                 ------> Inventory Org 2

Requirement: We need to raise purchase orders from the same OU for receiving in both Inventory Orgs.

The problem is that purchasing module will only allow items on PO that are assigned to one inventory org.

This Inv Org is the one specified in Financial Options for the OU.

We can only specify one Inventory Org in Financial Options and its a mandatory field.