Power BI Dataset Refresh Errors

Chris Webb has a workaround for dataset refresh errors when using Power BI and writing M code:

This is just a variation on the widely-used M pattern for using functions to iterate over and combine data from multiple data sources; Matt Masson has a good blog describing this pattern here. In this case I’m doing the following:

  • Defining a table using #table() with three rows containing three search terms.
  • Defining a function that calls the metadata API. It takes one parameter, a search term, and returns a value indicating whether the search was successful or not from the JSON document returned. What the API actually returns isn’t relevant here, though, just the fact that I’m calling it. Note the highlighted lines in the code above that show how I’m constructing the URL passed to Web.Contents() by simply concatenating the base URL with the string passed in via the custom function’s Term parameter.
  • Adding a custom column to the table returned by the first step, and calling the function defined in the second step using the search term given in each row.

This query refreshes with no problems in Power BI Desktop. However, when you publish a report that uses this code to PowerBI.com and try to refresh the dataset, you’ll see that refresh fails and returns a rather unhelpful error message:

Data source error Unable to refresh the model (id=1264553) because it references an unsupported data source.

The nature of the problem makes sense, and Chris provides one method of getting around this error.

Related Posts

Flattening Dimensional Models

Reza Rad explains why it makes sense to build flat dimensional models, particularly for Power BI: The article that I wrote earlier this week about the shared dimension had a lot of interest, and I’m glad it helped many of you. So I thought better to write about the basics of modeling even more. In this article, […]

Read More

Formatting Lists of Values with DAX

Alberto Ferrari and Patrick LeBlanc have a great video on formatting lists of filter values in DAX like 2003, 2005-2007, 2009: Alberto Ferrari joins Patrick to walk through how you can use DAX to format a list of values within Power BI Desktop. This takes the concatenate values quick measure to the next level. Transmuting […]

Read More


August 2016
« Jul Sep »