When I enter an order line in the detail tab and forget to set the quantity (the default in my configuration is null) I get a message that I have to enter that. That is ok and what I expect.

But then the line goes away and I have to enter the whole line new - not only the missing field. That looks like a bug.

Carlos Ruiz, [11.01.18 15:12]
seems like a "funny" bug - if you use the Save button on the header toolbar it shows "Fill mandatory fields: Quantity" and the line stays there
but if you use the small Save button in the detail - then same message is shown but the line is gone
if you use Alt+S shortcut is like if you pressed the header button - it works fine