remove Purchase lines ordering by item no

Hi everyone,

I have the page of purchase order. In this pages I have a page included with lines, the purchase lines





The problem I'm facing is in each order i'm making the purchase lines are being sorted by item no, and it's a mess when I want to persist a order of my products and check each one and don't want to alter it's order understand? So in my both cases no order was the best scenario.



I have a lot of keys in the purchase lines table, but for the purchase order at the moment i don't have anything in "SourceTableView". What can I do? In the images below you can see the same product in different lines.