Avoid Tax on PO created between two business units

Summary:

How to avoid tax on PO when created between two business units.

BU1 creates a PO for Supplier as BU2, or BU2 creates a PO for Supplier as BU1 so in this case tax should not apply to the PO.

When BU1 or BU2 creates PO for other suppliers then Tax should apply as it is.

Please advise if we can handle this.

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