Tag Field Name Data Type Description Used in
123 GapFillFlag

AbbrName: GapFillFlag

Not Requred in FIXML
Boolean Indicates that the Sequence Reset message is replacing administrative or application messages which will not be resent.

Valid Values:

N - Sequence Reset, Ignore Msg Seq Num (N/A For FIXML - Not Used)
Y - Gap Fill Message, Msg Seq Num Field Valid
SequenceReset