EA can do it. Just create a relationship between each one. Once you've done it, You can use the relationship matrix or whatever its called to highlight gaps as well. 

EA links any objects. I used to routinely use it for linking requirements to use cases, processes, etc. then use the relationship matrix as a RTM.

Don't have a licence at home but if you go to their forums or send their help desk a question they are very responsive.

Kimbo