Yes. There is a 1500 character limit that the ISV should enforce. The recommendation from the Elead team is to do one of two things: If possible, trim the comment to 1500 characters or less If the comments cannot be trimmed to 1500 characters, then truncate the first request to 1500 characters or less, and send in the remainder in one or more subsequent Add Comment requests until the entirety of the originally intended comment has been posted.