Product quantity is empty in BO, but in stock_available not

[mobster]

Hi everyone,

I have a problem with Product quantity.

In BO i removed all quantities of one product, it has 2 attributes and both are empty. Until here there's not problems.

But when i saw the quantity field in ps_stock_available it is not empty.

Is this a problem or configuration?

I dont know what i need do to solve and my customer whants a fast solution =S

Do you can help me please?

Details:

Preferences > Products > Products stock

    Enable stock management (Yes)
    Enable advanced-stock management (No)

Product page > Quantity tab

I want to specify available quantities manually.

 

Prestashop 1.6.0.9