Hi Setu, thanks for the response,

I know it, the quantity on hand = all quantity on my warehouse

and the forecasted quantity = the product that will be outgoing or incoming to my warehouse.

The thing that makes me confused is:

I have 28 units product on 14/07/2020 after inventory adjustment, then on 18/07/2020 I sell the product 4 units.

But after it, why now my stock is -4?

Can you show me Inventory adjustment you done on 14/07/2020?

Inventory adjustment line where I can check the real quantity and theoritical quantity of the project at that time.

Here is the screenshot for the inventory adjustment that I do on 14/07/2020:

https://pasteboard.co/JiE6Ztj.png

in Inventory adjustment form view there is one field which is invisible for now, make it visible temporary to check.

<field name="line_ids" invisible="0"/>

Once this field visible, you will see adjustment lines, by clicking on record you will see the theoratical qty and counted qty and see the difference.

Stock move done with 28 qty it doesn't mean you have 28 qty in stock at that time. It means product moves has been created with 28 qty to make your theoratical and counted qty equal.

I got the key:

"Stock move done with 28 qty it doesn't mean you have 28 qty in stock at that time"

Thanks a lot Man :)