Oracle Sourcing R12 – Requirement to Capture Supplier Brand at Quotation Stage Item + Brand

We are maintaining Item code in two segment as Item + Brand. PR is raised with Item and Generic brand. During quotation, Brand is finalized we want to change the Generic brand with the appropriate brand mentioned by the supplier. But we are nit able to change the Item code. How we can do in quotation in Oracle Sourcing r12?

We have defined the inventory item structure as Item + Brand, and inventory/stock is maintained based on the combination of Item + Brand.

However, the business requirement is:

• Requisition/RFQ: Request should be raised using the Item only.
• Quotation: Supplier should be able to specify/enter the