# Data aggregation and propagation across multi-level system device hierarchy

**URL:** <https://forums.losant.com/t/data-aggregation-and-propagation-across-multi-level-system-device-hierarchy/3882>\
**Category:** Help\
**Tags:** devices, system\
**Created:** [June 25, 2021, 5:06pm UTC](https://forums.losant.com/t/data-aggregation-and-propagation-across-multi-level-system-device-hierarchy/3882 "2021-06-25T17:06:32Z")\
**Posts on this page:** 1\
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**Author:** ![Nicolas\_Mascardi](https://avatars.discourse-cdn.com/v4/letter/n/47e85d/32.png) [@Nicolas\_Mascardi](https://forums.losant.com/u/Nicolas_Mascardi)\
**Post date:** [June 25, 2021, 6:47pm UTC](https://forums.losant.com/t/data-aggregation-and-propagation-across-multi-level-system-device-hierarchy/3882/4 "2021-06-25T18:47:59Z")

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Thanks Dylan for your quick reply.  
We thought about Experience Groups, but there is a limitation about the number of child groups that a given parent group can have. For instance. in the example above if the number of cities down State 1 is greater than 100 and I try to get all the aggregated data for State 1 using either the Gauge Query or the Time Series nodes, this error occurs:

> [@experienceUserId: Cannot resolve to more than 100 device query components](https://forums.losant.com/t/experienceuserid-cannot-resolve-to-more-than-100-device-query-components/3060):
>
> Hi, We are developing a multi tenant application, and the following error is occurring for users who have access to many groups, when I use the filter by experienceUserId. This error means that it is not possible to load users’ devices, as they have access to more than 100 experienceGroups (root or parent groups)? So I should limit the membership of users to new groups in order not to go beyond that limit, right? Failed to load. experienceUserId: Cannot resolve to more than 100 device query co…

That’s why we were looking to use System Devices, which we think there is no limitation about the number of nodes within the tree structure.

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