@book_type.setter<EOL><INDENT>def book_type(self, book_type):<DEDENT>
if book_type not in BOOK_TYPES:<EOL><INDENT>raise ValueError(ERROR_LOOKUP.get('<STR_LIT>') % (book_type, self.book_id, self.asset_manager_id))<EOL><DEDENT>else:<EOL><INDENT>self._book_type = book_type<EOL><DEDENT>
:param book_type: The type of book that we are creating - e.g. Trading, Wash
:return: