Disable all table item control in SO screen

Hi All,

My requirement is to disable the item control table in SO screen under modification(VA02). It means the table control and the buttons under it should be disabled.

My questions is

1. how to disable the whole table control at one time othan than column by column.

2. if i used screen-input = 0 to disable column, it works for existing rows only, users can still add new item line. how to disable it including the add and delete button under table control.

I am using MV45AFZZ - USEREXIT_FIELD_MODIFICATION.

CODES:

IF SY-DYNNR = '4900'.

IF SCREEN-NAME = 'RV45A-KWMENG'.

SCREEN-INPUT = 0.

ENDIF.

ENDIF.

Thanks

Wilson