# Unable to historize / chart "Uncertain" Data Quality tag values

**URL:** <https://forum.inductiveautomation.com/t/unable-to-historize-chart-uncertain-data-quality-tag-values/72790>\
**Category:** Ignition\
**Tags:** vision, ignition81\
**Created:** [April 23, 2023, 1:13am UTC](https://forum.inductiveautomation.com/t/unable-to-historize-chart-uncertain-data-quality-tag-values/72790 "2023-04-23T01:13:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ignition\_user123](https://avatars.discourse-cdn.com/v4/letter/i/9e8a1a/32.png) [@ignition\_user123](https://forum.inductiveautomation.com/u/ignition_user123)\
**Post date:** [April 23, 2023, 1:13am UTC](https://forum.inductiveautomation.com/t/unable-to-historize-chart-uncertain-data-quality-tag-values/72790/1 "2023-04-23T01:13:58Z")

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I have an OPC UA device set up in Ignition 8.1 with a MySQL database for tag historization. I am using Easy Charts in Vision to create tag plots. Whenever a tag goes from "Good" data quality to "Uncertain" data quality, it appears that the tag no longer gets historized and no longer displays on the chart. Is there a way to force Ignition to historize and display all data qualities in charts?

This appears to happen frequently with tags for this device even though and I know that the instrumentation is actually good but the device flags it is as uncertain. The manufacturer has acknowledged that it is an issue; however, since it's an off the shelf device, it would be very difficult tfor them to create a fix and push it to its customers within a reasonable amount of time.

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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:** [April 23, 2023, 3:44am UTC](https://forum.inductiveautomation.com/t/unable-to-historize-chart-uncertain-data-quality-tag-values/72790/2 "2023-04-23T03:44:14Z")

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Directly on that tag? No. But you can create a derived tag, and use the `forceQuality()` expression function to make it "good" anyways. Historize the latter tag.