Store returns to DC with a goods movement done first

Hi!

I would like to implement a process where store return is started by posting a goods movement with automatic returns PO created. That would need to move goods in to transit. From PO a returns delivery would be created, which would receive stock in transit in to the DC stock.

I need to get stock in transit when posting a movement with 161. I will copy it, but what defines for a movement type that goods are posted in to the stock in transit?