# Trigger a transaction group for all UDT instances

**URL:** <https://forum.inductiveautomation.com/t/trigger-a-transaction-group-for-all-udt-instances/96480>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [September 26, 2024, 9:30am UTC](https://forum.inductiveautomation.com/t/trigger-a-transaction-group-for-all-udt-instances/96480 "2024-09-26T09:30:18Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mehdi\_MECHEDAL](https://avatars.discourse-cdn.com/v4/letter/m/58956e/32.png) [@Mehdi\_MECHEDAL](https://forum.inductiveautomation.com/u/Mehdi_MECHEDAL)\
**Post date:** [September 26, 2024, 9:30am UTC](https://forum.inductiveautomation.com/t/trigger-a-transaction-group-for-all-udt-instances/96480/1 "2024-09-26T09:30:18Z")

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Hello,

I have the following UDT Definition in my gateway:

![Screenshot 2024-09-26 112242](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/c/ac7945eeed914c9cdc52ddf17c825c922654b77a.jpeg)

I created two UDT instances in my teg provider:

![Screenshot 2024-09-26 112228](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/7/a7eced3c91bd1726499a65dd36bcee24ba6c9fe3.jpeg)

**Question: Is it possible to set a transaction group that will be triggered if any of the activated tags changes its value ?**

I tried to do this but it does not work:

 ![Screenshot 2024-09-26 112721](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/2/62324ddfbca4eea660a27cc296875ff8098909d7.jpeg)

**If it is not possible, do you have any alternative ?** not that in my case it is not possible to create one transaction group for each UDT instance (I have more than 1000 per gateway)

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [September 26, 2024, 12:17pm UTC](https://forum.inductiveautomation.com/t/trigger-a-transaction-group-for-all-udt-instances/96480/2 "2024-09-26T12:17:07Z")

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There is no such functionality in Ignition. I'm working on a new historian type that will do approximately what you are attempting, but via the tag system. I'll bookmark this topic to comment when it is ready for trials.