Pack loose material into LPN and assign the LPN to order reservation

We are in the process of implementing WMS for one our existing inventory organizations. The existing inventory organization have exisitng subinventories aganist which order reservations are there. So the lot which needs to be packed into LPN have been reserved against an order. As part of go live we are planning to pack loose material into LPN . My question is if there are any order reservations against the loose material would we have to write scripts to update the reservations with the LPN information or is there an oracle seeded functionality available which can assign the LPN to the reservation .