TagField NameXML NameData TypeDescriptionDepr.Valid values
23IOIID@IOIIDString

Unique identifier of IOI message.

(Prior to FIX 4.1 this field was of type int)

Used in messages:
[CrossOrderCancelReplaceRequest] [IOI] [MultilegOrderCancelReplace] [NewOrderCross] [NewOrderMultileg] [NewOrderSingle] [QuoteResponse]
Used in components:
[ListOrdGrp]