Item Definition Grouping what is the risk if the Ref Org does belong to the same BU as it’s Def Org"

Summary:

Client has several sales offices configured as inventory organization. Sales Orders are placed in sales office to ship to customer from the sales office. Products are produced in a MFG plant and transferred to the sales office by TO. The sales office is in multiple countries. There are many sales offices and we would like to leverage the item definition grouping. However

the documentation states that the reference organizations should be in the same BU. Does anyone know the risk if the reference organizations are in different BU's

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