noun
back order
A business term for an order that cannot be filled immediately and is placed on back order.
その商品は現在バックオーダーとなっております。
That item is currently on back order.
Variant with interpunct; less common in running text.
取り寄せ refers to ordering an item for a customer, while バックオーダー specifically means the item is out of stock and the order is pending.
Loanword from English 'back order'.