Getting the maximum value for each order

Hi all,

I managed to solve it through af combination of the suggestions posted in the thread.

Thanks to everyone for inputs!

The solution for the time of controls was:

FirstControl =
    MINX (
        TOPN (
            1, 
            'QualityControl', 
            'QualityControl'[CheckedDateTime], 
            DESC 
        ), 
        'QualityControl'[CheckedDateTime] 
    )

SecondControl = 
    MINX (
        TOPN (
            2, 
            'QualityControl', 
            'QualityControl'[CheckedDateTime], 
            DESC 
        ), 
        'QualityControl'[CheckedDateTime] 
    )

As I actually needed the five latest times of control I just increased the TOPN value for each measure.