The following is a brief summary of the conclusions drawn in our Acquisitions <> Inventory discussion. Please comment on any discrepancies.
For V.1 any order will have a corresponding Instance and Holding in inventory
If the order is for an eBook (or other electronic resource), then there will be an instance, plus a holdings record (with URL, location, call number), but no item record
All physical items will have a corresponding "item record” in inventory
Inventory item status representing On Order, Receiving and Fulfilled. Will be updated in inventory by acquisitions modules using inventory's APIs
This assertion may change closer to implementation as the development teams define a best practice. (Inventory modules may check and update the item statuses themselves)