External filters does not affect ALLEXCEPT

Hi, 

I have a measure with ALLEXCEPT that allows me count the number of companies in a sector.  In the first table there are 18 companies in that sector so the count works. But in the same sector, when I filter by city, the count still takes the whole sector. The result must be 2. How can I solve that?

Hope you can help me. Here is my pbix file: https://1drv.ms/u/s!AtTnrgPUQzQCt342k1topoW817Qo

Have a nice day, 

Alejandro