Enabled Warehouse field as a mandatory in order entry page using sandbox but it not working.

Summary:

Our requirement is to make warehouse as mandatory field in Sales order

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Requirement is to make Warehouse field as a mandatory under Supply tab in sales order page, I have enabled required check box through sandbox customization, in expression builder , given value as 'true', system does not restrict users to enter Warehouse, sales order get submitted though we have made the field as required field. is there anyway we can make Warehouse as a mandatory field in Sales order.

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