Ship From Location in Shipment

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Hi Team,

I have a scenario as below -

Created Internal Requisition to transfer material from Org A to Org B across BU. The source Org on Internal Requisition and Transfer Order is Org A. After ship confirm, I can see that the ship from Location is showing as Location X in backend i.e. wsh_delivery_details. This Location X is not assigned to inventory Org A in 'Manage Locations'. I was expecting Location Y to be ship from Location which is attached to Inventory Org A. 

Please advise how ship from location is determined for Internal Transfer across BU.