Display null or negative quantities in orders

[Mando]

Hello,

 

After searching for some hours, I'm asking for your help..

 

I'd like products in null or negative quantities to be displayed in orders, something like that :

 

 

(It would be to have an history of the order and consider the trades-in. I guess there are some other tools to do this, but my shop uses this way for a long time, so they won't change just for this)

 

I manage to modify the orders, the amount is right (even with negative products (trades-in)), but they just aren't displayed.

 

I tried to find the right query or find some test saying "no not care about product with quantity lower or equal to 0", but I was unsuccessful.

 

Then, if anyone has a solution, or even just a track, that would be awesome

Thank you

 

Mando (Fr)