How to Fix Power Query M Code Failing in Another Excel Workbook
Question details
The user needs to resolve an issue where Power Query M code executes successfully in one workbook but produces errors when pasted into a different workbook.
- Product
- Microsoft Excel
- Device & OS
- not provided
- Scenario
- Copying and pasting Power Query M code from the Advanced Editor of one workbook into another.
- Observed behavior
- The code fails to run in the new workbook despite the visible steps appearing identical to the original.
Open the Advanced Editor in both the original and new workbooks side-by-side to easily compare the M code, and ensure the new workbook has access to the same underlying data sources.
Update Source References and Step Names
Ensure all workbook-specific query names, source columns, and step references match the new workbook's data structure.
Power Query steps are highly dependent on the environment of the workbook they were created in. When moving code, missing columns or differently named queries will immediately break the execution.
In Excel, open the Power Query Editor, then click 'Advanced Editor' under the Home tab.
Check the first few lines of the M code for the 'Source' step. Verify that the data path, table names, or named ranges exist exactly as written in the new workbook.
Ensure column names referenced in the code (such as 'Current Value') are spelled exactly as they appear in the new dataset, paying attention to spaces and case sensitivity.
Verify that all step references in your code exactly match the names of the preceding steps. Recreate any missing intermediary steps if necessary.
Correct Quotation Marks and Hidden Characters
Remove invisible formatting characters or smart quotes introduced when pasting code from external editors.
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Frequently Asked Questions
Why does my Power Query step say 'Column not found'?
This happens when the new workbook's dataset is missing a column referenced in the M code, or the column name has a typo, different capitalization, or an extra trailing space. You must verify and align the column names in your new dataset to match the code.
How do I access the Advanced Editor in Power Query?
Open the Power Query Editor, navigate to the Home tab on the ribbon, and click on the 'Advanced Editor' button in the Query group. This will open a window where you can view and modify the raw M code.
Can different Excel versions cause Power Query M code errors?
Yes, newer functions and transformations available in the latest M code updates might not be supported in older versions of Excel. If you copy code from a newer Excel version to an older one, unrecognized function errors may occur.
