Enable/Disable column editing in datawindow in rowfocuschanged script

//in rowfocuschanged event in datawindow, write this

long ll_budget

if currentrow > 0 then

ll_budget = this.getitemnumber(currentrow, 'expense')
  
    if ll_budget > 0 then
        this.object.kod_vot.protect = 1   //kod_vot is your column_name
        this.object.dasar.protect = 1       //dasar is your column_name
    else
        this.object.kod_vot.protect = 0
        this.object.dasar.protect = 0
    end if
end if

//this will disable editing if ll_budget is greater than 0 and enable editing if it is zeroin other way you can always do this in datawindow expression.
go to protect expression for the particular column then code this :-

if (budget > 0, 1, 0)

//means when budget value greater than 0, 1 = to protect (disable column edit) else 0 = enabled column edit.