How to sync the Business Unit Item Cost with the Supplier Item Cost

PeopleSoft 9.2

When updating the Item's Supplier UOM Price with a new effective date no later than today, we selected the "To be Updated" option for both the Standard Price and BU Price Update Status options. After saving, the Standard Price gets updated but not the Business Unit Cost. How do we sync the item price cost automatically?

Our Purchasing BU is ABC while our Inventory BU is XYZ. I suspect selecting the BU Price Update Status updates the Purchasing BU which we don't use for our Inventory.

Standard Price from the Item Master Table Pricing Navigation

Main Menu > Items > Define Items and Attributes > Purchasing Attributes > {item} > Item Supplier > Item Supplier UOM