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How to Fix Power BI Dynamic Data Source Refresh Errors in Power BI Service
Question details
The user needs to fix a scheduled refresh failure in Power BI Service caused by a dynamic data source created via a Power Query function.
- Product
- Microsoft Power BI
- Device & OS
- not provided
- Scenario
- Refreshing a Power BI report connected to a SharePoint List in Power BI Service.
- Observed behavior
- The report refreshes successfully in Power BI Desktop but fails in Power BI Service because the data source evaluates as dynamic.
Ensure you have access to edit the Power Query M code steps in Power BI Desktop and verify your data gateway settings in Power BI Service.
Modify Power Query to Use RelativePath for Web Requests
Rewrite the Web.Contents function to avoid dynamic data sources by separating the static base URL from the dynamic query string.
Power BI Service cannot evaluate dynamic data sources for scheduled refreshes because it requires a statically verifiable data source path before execution. To bypass this limitation, you must construct your web requests using the RelativePath and Query parameters inside the Web.Contents function.
Open your report in Power BI Desktop and click on 'Transform Data' on the Home ribbon to open the Power Query Editor.
Find the custom function or step querying the SharePoint List that uses a dynamic URL (for example, retrieving comments by appending an item ID directly to the base URL string).
Modify the M code to use a static base URL. Pass the dynamic parts of the URL using the 'RelativePath' and 'Query' record arguments within the Web.Contents function.
Apply the changes, verify that the data preview refreshes correctly in Desktop, and publish the updated report back to Power BI Service to configure the scheduled refresh.
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Frequently Asked Questions
Why does my data source work in Power BI Desktop but fail in Power BI Service?
Power BI Desktop evaluates queries dynamically at runtime, but Power BI Service requires static data source paths to securely validate credentials and configure scheduled refreshes before the query actually executes.
How can I avoid dynamic data sources in Power Query?
Use the 'RelativePath' and 'Query' options within the Web.Contents function in Power Query. This keeps the base URL static, allowing Power BI Service to recognize the data source, while safely appending dynamic parameters during query execution.
Can I use a Personal Gateway to refresh dynamic data sources?
Yes, installing and configuring the On-premises data gateway (personal mode) can sometimes bypass the static data source requirement in Power BI Service. However, rewriting the query using RelativePath is the recommended best practice for enterprise stability.
