# Multiple UDT definitions with same name in UDT hierarchy bug?

**URL:** <https://forum.inductiveautomation.com/t/multiple-udt-definitions-with-same-name-in-udt-hierarchy-bug/112066>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [November 10, 2025, 10:48am UTC](https://forum.inductiveautomation.com/t/multiple-udt-definitions-with-same-name-in-udt-hierarchy-bug/112066 "2025-11-10T10:48:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jarne.janssen](https://avatars.discourse-cdn.com/v4/letter/j/b487fb/32.png) [@jarne.janssen](https://forum.inductiveautomation.com/u/jarne.janssen)\
**Post date:** [November 10, 2025, 10:48am UTC](https://forum.inductiveautomation.com/t/multiple-udt-definitions-with-same-name-in-udt-hierarchy-bug/112066/1 "2025-11-10T10:48:31Z")

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In the case that multiple UDT definitions with the same names exist, it messes with the UDT hierarchy.

When I click “view UDT hierarchy” on this UDT definition (with path “Library 04/ControlModules/AM2D/02/002/AM2D”) it somehow refers to another AM2D definition in the hierarchy

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/c/0ce36eb9122b82948a6073510904ce949a11ac7c.png)

This is the definition it refers to

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/8/e/8e47fbff24636c92dc5d3934587a05c739918cd1.png)

While it should be referring to this

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/7/57256feab2b90cb0176c3fbe79848f80001de6db.png)

It somehow thinks its “Library 04/ControlModules/AM2D/01/002/002/AM2D”  
Instead of “Library 04/ControlModules/AM2D/02/002/AM2D”

It looks like it recognizes the same naming and structure and assumes it’s found the correct UDT definition in the hierarchy without looking at the actual UDT definition path.

I would like to know if this is a bug or if I am missing something, any help would be greatly appreciated!

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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:** [November 10, 2025, 1:52pm UTC](https://forum.inductiveautomation.com/t/multiple-udt-definitions-with-same-name-in-udt-hierarchy-bug/112066/2 "2025-11-10T13:52:08Z")

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Pretty sure this is a known bug, though I can't seem to find it quickly.

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**Author:** ![jarne.janssen](https://avatars.discourse-cdn.com/v4/letter/j/b487fb/32.png) [@jarne.janssen](https://forum.inductiveautomation.com/u/jarne.janssen)\
**Post date:** [November 10, 2025, 3:12pm UTC](https://forum.inductiveautomation.com/t/multiple-udt-definitions-with-same-name-in-udt-hierarchy-bug/112066/3 "2025-11-10T15:12:36Z")

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Alright thanks for the heads up!  
I am currently on Ignition version 8.3.0, would you happen to know if this bug also exists on previous Ignition releases?

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<div class="post-metadata">

**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:** [November 10, 2025, 3:21pm UTC](https://forum.inductiveautomation.com/t/multiple-udt-definitions-with-same-name-in-udt-hierarchy-bug/112066/4 "2025-11-10T15:21:00Z")

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Yes, pretty sure it goes back a ways.