GetMUBets and StartRecord

[Wonker_]

I have 22 Bets on a particular market (matched and unmatched).
If I call GetMUBets(startRecord=0, recordCount=200, BetStatus=MU) I get 22 bets returned.
If I call GetMUBets(startRecord=2, recordCount=200, BetStatus=MU) I still receive 22 bets.

How and when does the startRecord work? Does it only work for multiples of 200 (max of recordCount) or multiples of recordCount?