SWITCH not giving total

Hello, 

I need a formula that allows multiple conditions. Like if, else if, else statement. I read about and SWITCH seemed like a solution. 

So, my formula is:

IST + Plan= 
SWITCH(TRUE(),
    MAX(Date[BusinessYear]) == [CurrentBusinessYear] && SUM(History[ActualQty]) = BLANK(), SUM(Plan[PlanQty]),
    MAX(Date[BusinessYear]) ==[CurrentBusinessYear] && SUM(History[ActualQty]) <> BLANK(), SUM(History[ActualQty]),
    MAX(Date[BusinessYear]) <>[CurrentBusinessYear],
    BLANK()
    )

The formula gives the correct result per row. However, no total is presented: 

My wish was to obtain a sum for the current business year. The measure should contain a mix of actual and planned values. When there is a actual value already (for past months), then sum the actuals. Otherwise, for the future months, sum the plan values.

PS: I tried to reproduce this example in a dummy file but I was not able to replicate the problem. In my dummy example the function seems to work.

Do you have any idea what could be the problem?

Or how to use a diferent formula that does not involve SWITCH?