Hi @naossoan ,
Is it possible to create item for every warehouse from the first time the item introduced to the system ?
If yes, you can link them when doing transfer quantity of items between warehouses, because the record is already there.
If no, you need to check with interim screen and report back if it exists, and using different transfer screen for action create or action update, because currently we need to choose how we want to do action, if it is update, we need to grab the linked record first.