Mitigating a Role in CC 5.2

Hi Gurus,

We are mitigating a role in CC by a mitigating control ..

But when I re run the SOD report i see that the entire risk id gets mitigated whatsoever role was causing the conflict

For eg... If a t code is coming from Z , Y,, Z role...and causing the SOD.. Out of these three roles I mitigated only one role ie Y... When i re run SOD report I find that that Risk id is mitigated for all the roles...

Can anybody suggest something...

Parveen