For inbound transaction like a purchase order line, deprecated module WMSII uses the transaction status "Arrived" when you create a row in a Item arrival journal and you use a pallet transport. Now pallet transport is no longer usable, but the status "Arrived" can be still useful to report on InventSum when the goods is arrived in warehouse (item arrival journal line created) but not yet registered (item arrival journal line posted). The flow of the status should be: "On order" > "Arrived" > "Registered" > "Received" > ...