Crucial Exams

Microsoft Power BI Data Analyst Practice Question

You built a Power Query that imports an Excel worksheet, promotes the first row to headers, and then applies a Changed Type step. The source file owner later renames the header 'Unit Price' to 'UnitCost'. The next scheduled refresh fails with the message:

Expression.Error: The column name 'Unit Price' of the table wasn't found.

You need to fix the import error and keep every downstream step exactly as it is. What should you do in Power Query?

  • Edit the Changed Type step so that it references 'UnitCost' instead of 'Unit Price'.

  • Delete the existing query and rebuild it from scratch to match the new header names.

  • Switch the query's storage mode from Import to DirectQuery to avoid schema validation during refresh.

  • Insert a Rename Columns step immediately after the Source step that renames 'UnitCost' back to 'Unit Price'.

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