Tag	Field Name	Data Type	Description	Used in
23	IOIID AbbrName: IOIID	String	Unique identifier of IOI message. (Prior to FIX 4.1 this field was of type int)	NewOrderSingle ListOrdGrp NewOrderCross CrossOrderCancelReplaceRequest NewOrderMultileg MultilegOrderCancelReplace QuoteResponse IOI ( with FIXML abbr of ID )