If you use a host accounting system it is considered the defining SOURCE of inventory items and on hands.
1.When you set up new items you typically do it in Accounting. They are then imported into Acme.
2.On Hand Adjustments made in accounting are preserved. They are affected by transactions that happen in Acme, but they they are never over-written by activity that happens in Acme.
3.You create and receive Purchase Orders in your Host Accounting System. If you create PO's in Acme it is for "Acme Only' items that do not get set up individually in accounting.
Inventory transfers should can occur in the host accounting system or you can use a write off customer in Acme, "sell" the items in one store and return them in another.
If you do your transfers in Acme, the customer sales journal in Central Acme provides an excellent audit trail.