Unable to open PBIX file

Hi Russo 

You're getting this error because the PBIX file uses a composite model – it combines DirectQuery and Import tables, or multiple DirectQuery sources.
Power BI Report Server doesn't support composite models, so the file can't be opened in that environment.

Here’s what you can do:

• Open the file using regular Power BI Desktop (not the Report Server version) – it should open fine.

• Go to Model View, click each table, and check the Storage Mode.

  • If even one table is Import while others are DirectQuery – that's what triggers the error.

  • A common cause is using “Merge Queries as New” in Power Query – it silently creates an Import table even if the source was DirectQuery.

To fix:

• If the report is meant for Power BI Service – you're good. Composite models are fully supported there.

• If you're publishing to Power BI Report Server:

  • Make sure all tables are either Import or DirectQuery from a single source.

  • Delete any merged/imported tables that cause mixed storage.

  • Rebuild the logic using SQL views or clean DirectQuery connections.

If nothing works – just open a support ticket and let them investigate based on your specific environment.

If this post helps, then please consider Accepting it as the solution to help the other members find it more quickly

Hi Russo ,
Thank you for reaching out to the Microsoft fabric community forum. Also, thanks Ritaf1983 , for those valuable insights for this thread.

The error you are seeing is because your report uses a composite model (a mix of Import and DirectQuery), which is not supported in Power BI Report Server. This setup works in the Power BI Service, but Report Server only allows fully Import or fully DirectQuery models. To resolve this, you may either adjust your model to use just one mode or switch to publishing it in the Power BI Service. Please refer the link here for more information:
power-bi-report-server-feature-comparison 

I hope this resolve your query.If so,give us kudos and consider accepting it as solution.

Regards,
Pallavi G.