|Tag||Field Name||Abbr Name||Data Type||Union Datatype||Description||Pedigree|
Describes a class of sub book, e.g. for the separation of various lot types. The Sub Book Type indicates that the following Market Data Entries belong to a non-integrated Sub Book. Whenever provided the Sub Book must be used together with MDPriceLevel and MDEntryPositionNo in order to sort the order properly.