We are super new to ATUM and trying to learn quickly. We have a product that is a book. I had 2 copies of the book in stock and purchased 10 more. I clicked "add new inventory" to add the 10 and made the regular and purchase prices $2 more than the main inventory (the 2 we had in stock).
Priority on main inventory is 0. Priority on the added 10 inventory is 1.
As far as I know I have it set to do FIFO to reduce inventory.
I did an order for 4 books, expecting it to run 2 at the older price and 2 at the "plus $2 price". It charged all 4 at the older price. When I looked back at the product level stock after I did my order, the stock quantity of the main inventory was negative 2 and the new inventory was still at 10.
What am I doing wrong to prevent it from selling 2 books at the lower price and 2 at the higher price? Thank you!