Deployment Pipelines API - Error with itemType DataPipeline via Service Principal only

Hi garddolau ,

This is a great question and something many users run into with Fabric Lakehouse Semantic Models. Here’s what’s going on and what your options are:

Currently, you can’t create or manage field parameters directly from the Fabric Service UI for semantic models that were built entirely in Lakehouse. The traditional method of downloading to a PBIX file, making changes in Power BI Desktop, and then republishing is only available if you already have a PBIX version of your model. If your model only exists as a Service model, that option is not available.

Field parameters are still mostly managed through Power BI Desktop. The Service does not yet provide a way to add or edit them directly for Lakehouse semantic models.

What you can do right now is this:

• If you have a PBIX backup or can rebuild the model in Power BI Desktop, you can add field parameters using the Modeling menu, then publish it back to Fabric.
• If your model only exists in the Service, there is currently no supported way to add new field parameters. You might consider alternative approaches like using calculation groups or DAX-based solutions, depending on your reporting needs.

The Fabric team is working on adding more modeling features to the Service, and field parameters are a highly requested feature. It’s worth following the Microsoft Fabric Ideas portal and release notes for updates.

If you need help with rebuilding your model in Desktop or want to discuss alternatives for your scenario, just let me know. I’m happy to help with step-by-step guidance or suggestions that fit your use case.