When I bought my ticket they said it was not problem my whole name was not written, is this correct?

I bought my G15 ticket (Beijing - Shanghai) in an office inside Peking University. I have two last names: HIGUITA OTERO, but when I got the ticket it only shows HIGUITA OTER. (The last "O" is missing). I asked my friend who can speak chinese to ask the vendor if this is OK. The vendor said there is not much space to write there in the ticket, and that this will not be a problem. In the bottom of the ticket I see my passport number (two digits do not shown) and my almost complete last name. Will this be OK as the seller said? Thank you!