Removing outliers

Hi, I need some help to remove outliers from my data calculation. I have a MRO Material Stock list and the movimentation of that materials. I need to calculate the average and the max of lead time when buying that materials but I have some outliers in that data. 
that a data sample:

I have tryed that solution: 

NOOUTMAX leadtime = 
var q1 = CALCULATE(
    PERCENTILEX.INC(MB51, MB51[Leadtime], .25),
    ALLEXCEPT(MB51, MB51[Material]))
var q3 = CALCULATE(
    PERCENTILEX.INC(MB51, MB51[Leadtime], .75),
    ALLEXCEPT(MB51, MB51[Material]))
var iqr = q3-q1
var upperpec = q3+iqr*1.5
return 
    CALCULATE(
       MAX(MB51[Leadtime]),
       FILTER(ALL(MB51), MB51[Leadtime]>0 && MB51[Leadtime]<= upperpec))

But I get to type of "errors". One when my data relationship is setted MB51 many*:one Stock list. The erros is, all my calculated column is blank
The another erro is when my data relationship  is setted MB51 many*:many* Stock list. The error is: some lines is well calculated and anothers is blank. Like the print above:

how to solve that error or another solution to remove outliers from my calculation. 

Thanks in advance