Hi, @pennpower99
Based on your error message, you supposes change a column name which exists in a table already. And you may also have reference to this column in some calculations within other dataset so that other tables will also throw error related to this column. Make sure your change the name of this referenced column in all measures/calculated columns.
For reference:
Solved: Measure Name already exists while no double names - Microsoft Power BI Community
Solved: Duplicate name of measure - Microsoft Power BI Community
Duplicated names in DAX - SQLBI
Best Regards,
Community Support Team _Charlotte
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