Changing BU on existing Revised Sales Order

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Dear Experts

We have a situation in which existing SO in BU 1 need to be updated with a Warehouse. But at the same time, we want to

update BU 2 on SO fulfillment line so that Revenue and Receivable account will have company code as per updated BU2.

Can anyone suggest how it is feasible? May be OM extension, Pre-Transformation rule or Post-Transformation Rule or Process Assignment Rule???

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