Filter with calculated measures

hi,

i know that calculated measures is changing regard it's context.

i'm using a 'Text' type calculated measure to filter another calculated measure.

since it's value is not stable, filter with calculated measure is not gining me the right result

for exmample; Measures='ab'

calculate (sum(x),filter(y,column='ab') is not the same as calculate (sum(x),filter(y,column=Measures)

do you know why?

how can i filter with dynamically filter?

thanks!