# Incorrect data format for MsgSeqNum

**URL:** <https://forum.fixtrading.org/t/incorrect-data-format-for-msgseqnum/3357>\
**Category:** General Q&A\
**Tags:** general-qa, xid\_166743, imported\
**Created:** [September 19, 2001, 1:12pm UTC](https://forum.fixtrading.org/t/incorrect-data-format-for-msgseqnum/3357 "2001-09-19T13:12:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![GrzegorzKolodenn\_x](https://avatars.discourse-cdn.com/v4/letter/g/9fc29f/32.png) [@GrzegorzKolodenn\_x](https://forum.fixtrading.org/u/GrzegorzKolodenn_x)\
**Post date:** [September 19, 2001, 1:12pm UTC](https://forum.fixtrading.org/t/incorrect-data-format-for-msgseqnum/3357/1 "2001-09-19T13:12:00Z")

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Imported from previous forum

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**Author:** ![GrzegorzKolodenn\_x](https://avatars.discourse-cdn.com/v4/letter/g/9fc29f/32.png) [@GrzegorzKolodenn\_x](https://forum.fixtrading.org/u/GrzegorzKolodenn_x)\
**Post date:** [September 19, 2001, 1:12pm UTC](https://forum.fixtrading.org/t/incorrect-data-format-for-msgseqnum/3357/2 "2001-09-19T13:12:00Z")

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When a tag has incorrect value or contains data in incorrect format the Reject message should be sent. This message has the RefSeqNum field marked as required (see: FIX documentation). But what should be done in case when the wrong formatted tag is MsgSeqNum (i.e. MsgSeqNum is not a valid integer)? Should I send Reject message with non-integer value for RefSeqNum, or send Logout request, or just disconnect?

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**Author:** ![fplpo\_x](https://avatars.discourse-cdn.com/v4/letter/f/7ab992/32.png) [@fplpo\_x](https://forum.fixtrading.org/u/fplpo_x)\
**Post date:** [October 30, 2001, 7:12pm UTC](https://forum.fixtrading.org/t/incorrect-data-format-for-msgseqnum/3357/3 "2001-10-30T19:12:00Z")

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[original email was from Peter Lada - [lada@twinsun.com](mailto:lada@twinsun.com) ]  
\> When a tag has incorrect value or contains data in incorrect format the Reject message should be sent. This message has the RefSeqNum field marked as required (see: FIX documentation). But what should be done in case when the wrong formatted tag is MsgSeqNum (i.e. MsgSeqNum is not a valid integer)? Should I send Reject message with non-integer value for RefSeqNum, or send Logout request, or just disconnect?

My take on this is that since the message does not have a valid MsgSeqNum Flag, it is not a valid FIX message (kind of like a message without the BeginString flag). You should just discard it as garbage. If it was a transmission error that invalidated the MsgSeqNum tag, it will be resent if you issue a ResendRequest upon receipt of the next message, an the dicovery of missing SeqNums.

Peter Lada