# Tag reference history when source path changes

**URL:** <https://forum.inductiveautomation.com/t/tag-reference-history-when-source-path-changes/68782>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [January 19, 2023, 11:12am UTC](https://forum.inductiveautomation.com/t/tag-reference-history-when-source-path-changes/68782 "2023-01-19T11:12:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![bfreeman](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bfreeman/32/87436_2.png) [@bfreeman](https://forum.inductiveautomation.com/u/bfreeman)\
**Post date:** [January 19, 2023, 11:12am UTC](https://forum.inductiveautomation.com/t/tag-reference-history-when-source-path-changes/68782/1 "2023-01-19T11:12:47Z")

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Hi,

I am using tag history on a tag reference and trying to figure out how it works on source path change.

I did a simple test setup with 2 memory tags and a reference tag (all integers). History is enabled on the reference tag with an "On change" sample mode.

If changing source path to a tag which value **hasn't changed** , **no value** is historised.

If changing source path to a tag which value **has changed** , the value is historised but also an **extra 0 value** which is problematic.

![Capture d’écran du 2023-01-19 12-10-00](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/c/cce168902ac83bc4b25b3766ac58cabc95401ff6.png)

Are these behavior expected?

Thank you