--- title: GapFillFlag <123> field – FIX 4.3 – FIX Dictionary – Onix Solutions description: GapFillFlag <123> field – FIX 4.3 – FIX Dictionary – Onix Solutions --- ![Dictionary icon](https://www.onixs.biz/hubfs/SIC_website_2020/images/interface/img-icon-book.svg) # GapFillFlag <123> field – FIX 4.3 – FIX Dictionary | Messages by MsgType \| Messages by Name \| Fields by Tag \| Fields by Name \| FIX 4.3 \| Home FIX 4.3 : GapFillFlag <123> field Type: Boolean Used In Description Indicates that the Sequence Reset <4> message is replacing administrative or application messages which will not be resent. Valid values: Y = Gap Fill <4> message, MsgSeqNum <34> field valid N = Sequence Reset <4>, ignore MsgSeqNum <34> Used In Sequence Reset <4> | | --- | | ![](https://www.onixs.biz/hs-fs/hubfs/fix-dictionary/img/spacer.gif?height=5&name=spacer.gif) | - Follow OnixS - [Follow us on Twitter ](https://twitter.com/onixsbiz) - [Connect with us on LinkedIn ](https://www.linkedin.com/company/onix-solutions/) We track how people interact with our online web content and resources, and some of that tracking involves storing cookies on your device. By continuing to use our site you accept that you agree to this. For more details see our [Cookie usage, and Data Privacy and Protection Policies](https://www.onixs.biz/cookies-and-privacy.html). [Ok](https://www.onixs.biz/fix-dictionary/4.3/tagnum_123.html#) [OnixS ](https://www.onixs.biz/) Menu --- --- [OnixS ](https://www.onixs.biz/) ### Search the site Search