Strange code on NAV 2013 Page 1007 Job Planning Lines

Hello Fellow NAVisionists.
Recently one of our customers ordered me to do some changes in Jobs module.
Now I have done some studying, and there seems to be some code in OnOpenPage trigger on Page 1007 I do not understand. Similar code is in Page 92 Job Ledger Entries.

    OnOpenPage=VAR
                 Job@1000 : Record 167;
               BEGIN
                 IF Job.GET(JobNo) THEN
                   CurrPage.EDITABLE(NOT (Job.Blocked = Job.Blocked::All));

//++huh?
                 IF ActiveField = 1 THEN;
                 IF ActiveField = 2 THEN;
                 IF ActiveField = 3 THEN;
                 IF ActiveField = 4 THEN;
// --huh?
               END;

ActiveField is Option type global with option string " ,Cost,CostLCY,PriceLCY,Price".
This code does not appear in nav 2009 page, only in 2013.
There is also a function SetActiveField which changes the ActiveField value, and it is usually called before opening this page from elsewhere.
However, in my opinion this code does nothing! Is there a hidden purpose for this code?

Any ideas, anyone? :-k