Datamart: Adding columns using DAX instead of PowerQuery

Hi FrancisMarquez ,

When the connection mode is Live Connection, model actions like build relationships, create calculations etc. are not supported in Power BI for the data source is a tabular model that can be used by Power BI directly. For such kind of data source, calculations like create Calculated columns, measures are completed in the data source. When you live connect to Datamarts, these limitations are applied as well. Fortunately, Power BI provides the ability to change the connection mode of Datamarts from Live Connection to Direct Query if you would like to calculate on connected model. With the Direct Query mode, you could build your Calculated columns and relationships.

Before the switch, you need enable DirectQuery for PBI datasets and AS in the Preview features and restart your Power BI Desktop.

Click on Make changes to this model

Then, the connection mode is Direct Query. You could create Calculated column or build relationships in this environment.

However, there still some considerations when creating Calculated columns with Direct Query mode. For more details, you could refer to Use DirectQuery in Power BI Desktop - Power BI | Microsoft Docs.
Thanks ,
Pratyasha Samal
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