One Requistion Business Unit vs Number of Req BU's

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Here is our  Business Requirement

Business has 10 Legal Entities, all the 10 Legal Entities are Raise Expense Purchase orders, No Inventory organizations under these legal entities.  Need to Create one Requisition Business unit / Procurement Business Unit and raise Purchase orders for these legal entities.

Example: My LE Naming convention will be LE1, LE2, LE3 etc.

Requisition  BU default Legal entity set up as LE1 and Default Deliver to inventory org at config Req. Business unit functions belongs to LE1

Create a Expense Purchase order for LE1, the Purchase order created with sold to Legal entity on the PO is LE1, No issues.