Hi Pavel,
No, isn’t correct. The word “reservado” in Spanish is not back order. The word “reservado” is when something is kept specially for a particular purpose.
I disabled the ATUM for the product (look at here), and It automatically change its state to “out of stock” (“agotado” in Spanish) like this (The product is Raspberry Pi 3 Model B – kit básico). By other hand, the product doesn’t show in the e-commerce.
Then, I suppose that ATUM is affect somo state of products in WC.
Thanks for your support and your time.
Rodrigo.