We need a way to do overrides for GL BU on Express Putaways

Does anyone have any suggestions or input on the following?

The current Express Putaway that our accounting department uses to return items to inventory does not have an override GL BU field to allow them to designate a GL BU  (for returns from GL BUs that do not own the inventory). The GL BU information is needed so that accounting can return an item from one location and designate a different account, alt account, project, etc. to credit the cost to – while booking the debit in the other inventory location. Intercompany A/R and A/P entries also need to be created.