Cannot be used in Current Context DAX Measure

[question57]

Hey I try to create a Measure but it always gives an Error. What am I doing wrong?

Here is an example of the Error how you can recreate it. 

[AntrikshSharma · Accepted solution]

@question57 Non Iterator function don't work over variables, replace MAX with MAXX.

[question57]

Thx

[FreemanZ]

try to replace vT_VK[VKF] with [VKF]

[question57]

 If i put it like this it still cant find it