Conversion Rate Type is not defaulting onto the Requisition and PO correctly

Summary:

My current Customer has 2 main Scenarios for their Requisitioning Business Units:

Scenario 1: Requisitioning Business Unit is enabled for all functions except Procurement. The Same Business Unit is used for Requisitioning, Receiving, Invoicing, Payments, etc.

Scenario 2: Requisitioning Business Unit is only enabled for Requisitioning, Receiving, Materials Management.

• They have 1 Procurement Business Unit that is only enabled for Procurement.
• All of the Purchase Orders are automatically created from Approved Requisitions.
• We would like to use a Conversion Rate Type of Corporate for Requisitions and Purchase Orders.

When we create a Requisition for the Scenario 1 Requisitioning Business Unit and change the currency on the Requisition, the Conversion Rate Type defaults to Corporate from the Common Options for Payables and Procurement. When the PO is automatically created, the PO is created with the Conversion Rate Type of Corporate (defaulted from the Common Options for Payables and Procurement).