I resolved it:
1. Check in which Quarter I am now (based on the calendar) (Quarter Column):
=If(Mod(CurrentDate("M"),3)=1,Round(CurrentDate("M")/3,0)+1,Round(CurrentDate("M")/3,0))
2. Defined the formula to always turn proper Quarter values (Q1 YTD):
=if({Quarter Column}=1,Quarter(TCO Unit),if({Quarter Column}=2,Quarter(TCO Unit,-1),if({Quarter Column}=3,Quarter(TCO Unit,-2),if({Quarter Column}=4,Quarter(TCO Unit,-3),0))))
3. Then based on the Quarter YTD created average and multiplied by 12:
=12*({Q1 YTD}/3)
Seems to work! :)
#ApptioforAll