Type: int
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.
Values are bilaterally agreed.
Added in protocol FIX.5.0 (47)
See in: FIX.5.0SP2, FIX.5.0SP2 EP240.