Rolling and expiry dates for emissions futures contracts

Hello, I'm trying to work with historical prices of futures on emissions EUA, which I downloaded from Bloomberg terminal. I have timeseries which span years, and I need to find corresponding rolling dates and expiry dates. Questions: for given below contract description, MO13 Comdty, what does Underlying field "MOU9 Comdty" mean? Also, I expanded list of contracts and I can see that all of them have Start and End dates around 3 months - but I would expect a Generic 13th 'MO' Future contract to have a longer time to expiry... How to read that?