PP-PM Integration-capacity block due to maintenance order

Hi guys,

I have an work center under which i have grouped 3 similar machines which has both machine & labour category

Now with respect to notification(that one of the m/c in that wrok center got break down) from production if a maintenance order is planned then in CM 27 screen iam able to see the capacity getting blocked

The problem is capacity is getting blocked for the whole work center,iam not able to dispatch for the other two m/c,my requirement is that i should be able to dispatch the operations in other 2 machines,so what should be done to address this issue?