If you happen to have any blank rows in the table, you may see Column contains blank values and this is not allowed many-to-one relationship. Several Power BI users have reported a similar error in the Power BI Community forum. Follow the steps listed in this article to troubleshoot this error in Power BI service and desktop client.
How can I fix the power BI error blank values?
1. Delete Invalid Relationship Between Data Sets
2. Disable Include Relationship Columns Option
3. Other Solutions to Try
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