I have done this in the past a couple of times. One time it went flawless (2009), another not so much (2012). When it went well I arrived in my room with the customary "state board credit note", the other time the monies were not on my account (intent was to prepay cabana, state board credit I was entitled to at booking was not there either). While it was finally resolved it was more of a challenge than just going down and putting money on the account after onboard. If you are able to put money on your account I would ensure that you document document document with the name of the person you speak with, the date, time, etc