I'm trying to send foreign aid, and the game won't let me. I only have 4 current deals, but it says that I have too many. I have a foreign ministry, so I should be able to do 5 deals.

Perhaps the other nation has too many?

Possibly. I may have just read it wrong.

usually if the other nation has all slots filled the bottom of the screen where you click to send will say something like this nations slots are filled i think im not too sure