Not a show stopper but....

Just wanted to get some comments thoughts on some of the input send labels in X1 when sidechaining. For those with ADS, this might be complicated but bare with me.
 
Example: 
Key track - The Vocal Aux Buss 
 
Sidechain Compressor track
This is the Guitar Aux buss which has the ProChannel EQ and 4k compressor turned on with the sidechain activated.
 
When I go to set up the key track to activate the sidechain compressor I see the following send choice:
 
Built in Channel FX (Input 2) - Guitars
 
I would have thought it should say Buss Compressor (Input 2) -Guitars
 
There are other entries in the sends list which designated Buss vs Channel FX. So the question is, how does Sonar X1 differentiate as to which one appears in the list of sends?