In Pio you can come across a term called "shelf item". This is basically storing of items in shelves and in the same time have the inventory available in Pio.
Shelf items are usually products that are too big or oversized items that don't fit in a bin but which you still want to stock in Pio.
When you store products in shelves, they will be included in the normal picking flow in the app.
Read more about How to store shelf items