I forgot to move drafted international players onto R-league rosters, so check you picks and make sure they are all there. If one is missing, find him with the search function, move him to A-ball, and then to R-league (or wherever you want him). Moving them straight to R-league won't work.
FYI, If you move a drafted international player all the way up to the active roster, then drop him to rookie league, it doesn't hurt his mood like moving him to A and then to R does.
*Thanks Chappy for posting this in NPBL!