phase relation in ratrace in ADS? which one is correct?

Dear all

I drew an ideal ratrace in ADS and simulated it. I wanted to check the phase relation between them but I face a problem!

I thought that

1) phase(S(4,3)-S(4,2))
and
2) phase(S(4,3))-phase(S(4,2))



will end in same result but they are different.

which one is the correct one?

phase(S(i,j)-S(i,k))
or
phase(S(i,j))-phase(S(i,k))

2) is correct if you want the see the phase difference.