Quote Originally Posted by mmk View Post
Trade:

Countries you trade with (have negotiated a trade agreement with, as shown in the diplomacy window) do not appear on your trade list. Neither is any income from these countries.
I had this with Sweden when playing UK campaign and with the Ottomans when playing as Prussia.
Could it be that 1) you do not produce anything they need/lack at the time; 2) their trade routes are blocked?

I usually see everyone I have agreements with in my list though.