Numbers on Immigrationrecords

In my hunt for Anna Gulette Andreasdatter, I found her record Look here: /forum/anna-gulette-olsenandreasdatter-nor-usa-1909/ But by studying her records from Boston, I see a number which I can not understand what it refers to. Her record is listed here: http://search.ancestry.com/cgi-bin/sse.dll?db=bostonpl&cj=1&pcc=2&hc=50&yearend=10000&f17=mar*&rs_f16__date=0&fh=0&rg_f16__date=1909&gsfn=Anna*&gsln=Olsen*&year=0&rank=0&f18=18&f13=Saxonia*&o_xid=0002370638&o_lid=0002370638 In front of the number on the list, there is a number . "1122" What does this refer to? Berta