Creating Qlik Variables with Set Analysis in Script

SET vUnderYear ="=max(undyr)";// 2013
SET vRepStartYTDDate ="=Num(Floor(min({<undyr={'$(vUnderYear)'},Quarter=>}%Date_Date_Key)))";// 41275
SET vRepStartDate ="= Num(Floor(MonthStart(min({<undyr={'$(vUnderYear)'}>}%Date_Date_Key))))";// 41275
SET vRepEndDate ="=Num(Floor(MonthEnd(max({<undyr={'$(vUnderYear)'}>}%Date_Date_Key))))";// 41364
SET vPeriodSelected ="=GetSelectedCount(Year)+GetSelectedCount(Quarter)+GetSelectedCount(Month)+GetSelectedCount(undyr)+GetSelectedCount(CalendarYear)+GetSelectedCount(CalendarQuarter)+GetSelectedCount(CalendarMonthName)";// 2
SET vErrorMessage = 'Please select UWYR and Transaction Period' ;// Please select UWYR and Transaction Period