How Oracle OM/DOO can provide the price via their mapping tool for B2B process when don't have BPA?

Purchase Requisition not created as outcome from back to back sales order when a non-primary UOM is used on the Sales Order line for the item. They are using common pricelist for all item line type based not each individual Item wise. So user created Sales Order in non-primary UOM, this required for their business process also.

Below error occurs:

A value is must for the Price attribute. For master items, you must provide a price when there's no list price defined for the item in Product Information Management or a different UOM other than the primary UOM of the item is provided.