variable in formula

first varaible is VPE_Date

=if(GetSelectedCount(PE_DATE)>0,Date(Max(GetFieldSelections(PE_DATE))),Date(max(PE_DATE)))

in this formula i think the logic is if we select any date   from dec i.e. '2-Dec-2019' then PEDate will set max '31-Dec-2019'  .. same goes for other month if we select date 12-Nov-2015 then PE DATE will set max as 30-Nov-2019..

and your logic is working fine when i just try this ..

VPEDate = 
IF (COUNTAX ( Calender, SELECTEDVALUE ( Calender[PEDATE]) ) > 0,MAX ( Calender[PEDATE] ))

PE_Date is calculated in script like this (THIS IS QLIKSENSE SCRIPT)

PE_DATE:
Load 
	 QuarterEnd(Date('01-Jan-2015')+IterNo()-1) as PE_DATE
     AutoGenerate 1 While QuarterEnd(Date('01-Jan-2015')+IterNo()-1) < QuarterEnd(Today());

then after this  i  should called this varaible "VPE_Date "  in Ear_Factor formula..

(
RangeMax(0,RangeMin(( POLICY_END_DATE-POLICY_EFFECTIVE_DATE+ 1),(Date(vPE_Date) - POLICY_EFFECTIVE_DATE +1)))
)
/
(POLICY_END_DATE-POLICY_EFFECTIVE_DATE+ 1)

then i called this "Ear_Factor " in Premium_earn formula  Icey 

Sum(GROSS_PREMIUM * $(vEarnedFactor))