# Offline Data Reading in Runtime Properties

**URL:** <https://community.appfarm.io/t/offline-data-reading-in-runtime-properties/1629>\
**Category:** Ask the community\
**Tags:** offline-support\
**Created:** [February 10, 2025, 10:38am UTC](https://community.appfarm.io/t/offline-data-reading-in-runtime-properties/1629 "2025-02-10T10:38:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![JustineC](https://avatars.discourse-cdn.com/v4/letter/j/ecae2f/32.png) [@JustineC](https://community.appfarm.io/u/JustineC)\
**Post date:** [February 10, 2025, 10:38am UTC](https://community.appfarm.io/t/offline-data-reading-in-runtime-properties/1629/1 "2025-02-10T10:38:57Z")

</div>

Hello everyone,

I’m developing an offline application where I load data into a Runtime Properties table (`ORT - Intervention`) while online.

When I switch to offline mode and click on an item iterated from the `ORT - Intervention` list, I attempt to read the selected object in the context by loading it into a Runtime Table (`RT - Intervention`) with cardinality one.

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/appfarm/original/2X/8/81d3cfa7551a9a21ba6c1f6e97fd1fa71ab545df.png)

However, while this works perfectly online, I encounter the following error when offline:

![image](https://europe1.discourse-cdn.com/flex013/uploads/appfarm/original/2X/b/bf799bde1662106349bbbb09b111e197e5cc8d89.png)

Does anyone know why this error occurs in offline mode and how I can resolve it?

Thank you for your help!

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<div class="post-metadata">

**Author:** ![ErikAKSkallevold](https://dub1.discourse-cdn.com/flex013/user_avatar/community.appfarm.io/erikakskallevold/32/1378_2.png) [@ErikAKSkallevold](https://community.appfarm.io/u/ErikAKSkallevold)\
**Post date:** [February 10, 2025, 11:25am UTC](https://community.appfarm.io/t/offline-data-reading-in-runtime-properties/1629/2 "2025-02-10T11:25:25Z")

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Hi,

Do you have any Generated Datasources in your app? These are join tables, created by Appfarm automatically when you use deep databindings.

To see if you have some, you can enable `Show Generated Datasources` in DevTools.

 ![SCR-20250210-lcws](https://europe1.discourse-cdn.com/flex013/uploads/appfarm/original/2X/5/5d67df46d77726a51775cc7023129dadde165009.png)

All Generated Datasources will then be visible in the data-tab in Devtools.

 ![bilde](https://europe1.discourse-cdn.com/flex013/uploads/appfarm/original/2X/7/7bc91ef856fac9fd283fb7a00d83293fcedc95be.png)

You cannot have Generated Datasources in your app. From the docs:

> - If you use Deep Data Bindings (_Example: displaying_ `Orders.Product.Price`), you must **use** [**Reference Data Sources**](https://docs.appfarm.io/reference/apps/data/data-sources#reference-data-sources) (_Example: You must add_ `Products` _as a Reference Data Source on the_ `Orders ` _Data Source_)

[You can read more here.](https://docs.appfarm.io/how-to/data-modeling/offline-data-handling)

// Erik