i am follow this step User document > https://www.odoo.com/documentation/user/9.0/inventory/barcode/operations/adjustments.html

but Text underline 

" If you manage multiple locations, scan the location before scanning the products. Eg. scan a shelf's barcode ; scan each product on the shelf ; repeat for each shelf in the wharehouse. ""

I cant use a barcode reader to import product

Picture a Problem > https://www.mx7.com/view2/zSIEfqbYAQ4ei3ej

I can not use a barcode reader to import product for inventory but i can read the barcode location

I want to use the system like this example clip >> https://www.youtube.com/watch?v=0DvXnBxJovg

How i can set it up?