Replenishment | Convert transfer order suggested by plan to Purchase order

Hi,

we have a replenishment plan at subinventory level.

Based on the sourcing rules and assignment set, the system generates transfer or purchase orders. (the transfer order are suggested between two subinventories of the same organization)
We need to be able to easily convert a purchase order into a transfer order and transfer order into a purchase order.
When attempting to do this, from the “supplies and demand” view, we noticed that it is possible to change a transfer into a purchase order by deleting the source organization (which reports “Organization:SourceSubinventory”) and entering the desired supplier.
However, when attempting to change a purchase order into a transfer, by trying to select the subinventory in the “source organization” field, we noticed that we can only select the subinventory for which the plan was created. We cannot therefore select other subinventories and convert a purchase order into a transfer proposal.