# Cannot show average session time in custom table

**URL:** <https://community.piwik.pro/t/cannot-show-average-session-time-in-custom-table/4737>\
**Category:** Reports and working with data\
**Created:** [December 18, 2024, 6:19am UTC](https://community.piwik.pro/t/cannot-show-average-session-time-in-custom-table/4737 "2024-12-18T06:19:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![j\_ask](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@j\_ask](https://community.piwik.pro/u/j_ask)\
**Post date:** [December 18, 2024, 6:19am UTC](https://community.piwik.pro/t/cannot-show-average-session-time-in-custom-table/4737/1 "2024-12-18T06:19:07Z")

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Hi there,

I have a table in a dashboard that is grouped by date (in quarter), country, and channel. I tried showing ‘average session duration’ for each group by changing **session time** to **average session time** as suggested in the [help center](https://help.piwik.pro/support/reports/converting-dimensions/). However, it is showing me an error message: Incorrect combination of data: dimension (event), metric calculated from dimension (session).

Please help advise solutions or workaround, thanks!!

BR  
Jerry

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**Author:** ![Adam](https://dub1.discourse-cdn.com/flex005/user_avatar/community.piwik.pro/adam/32/1494_2.png) [@Adam](https://community.piwik.pro/u/Adam)\
**Post date:** [December 18, 2024, 12:46pm UTC](https://community.piwik.pro/t/cannot-show-average-session-time-in-custom-table/4737/2 "2024-12-18T12:46:30Z")

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Hi @j_ask,

As you mentioned it’s due to conflict of the dimensions scope, here is article exaplaining it: [Why can’t I combine certain dimensions and metrics? | Piwik PRO help center](https://help.piwik.pro/support/questions/why-cant-i-combine-certain-dimensions-and-metrics/)

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**Author:** ![system](https://europe1.discourse-cdn.com/flex005/uploads/piwikpro/original/1X/db7013c4fd6a24443b339309db52f14995207737.png) [@system](https://community.piwik.pro/u/system)\
**Post date:** [January 1, 2025, 12:46pm UTC](https://community.piwik.pro/t/cannot-show-average-session-time-in-custom-table/4737/3 "2025-01-01T12:46:39Z")

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Closed on January 1, 2025, 12:46pm UTC

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