I'm sure that this works as I recall using it successfully to send aid to Turkey from Germany. There may be a couple of things in play and I believe that aid is the last expense deducted even if the deduction shows off the top. If so this means that if there are any events/issues that reduce the Givers EP below the level of the gift, the transaction will not happen.
So, Germany gives 10-EP to Turkey but blockade and strategic bombing reduce the remaining sum total of the German economy before the aid to <10, the aid will not appear in Turkey next Interphase.
Without more details or a saved game (and I don't think this new Forum supports posting saves) it's difficult to be sure.