[SAP-SD]How to make open quantity non-editable in item selection

Hi guys,

I have a question need your help/advice.

In some business cases, we create sales order with reference to a quotation. In the screen of item selection, we want to make the column "Open quantity" non-editable while keep the column "Selection" selectable. As shown below:

As I know, there is one configuration point in the copy control of Header for Sales Document to Sales Document, which is "Complete reference". But if I mark this field, both columns "Selection" and "Open quantity" are non-editable. This is NOT what we're expecting. As shown below:

Is it possible to fulfilled this requirement only by configuration? If yes, how? If not, anything else should I do? User-exit, enhancement, screen enhancement, or something else?

Any comment or advice from you would be appreciated.

Thanks.

Michael Hwang

Mar 11, 2016