Many to many relationship in BI

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I've just started to use Power BI designer and noticed a documentation that mentions being able to establish a many-to-many relationship within the tool. But when I try to do the many-to-many join, I receive an error that says "You can't create a relationship between these two columns because one of the columns must have unique values."

Can anyone tell me what am I doing wrong?

Thanks in advance.

Nov 28, 2018 in Power BI by Shubham
• 13,110 points
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1 answer to this question.

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This is an error in the documentation. 

As you've noted, you can't specify this in the relationship dialog. Many to many relationships require a junction table to work (a table in the middle that says how the two tables should be correlated.) You may be able to get what you want with a 1:1 or M:1 relationship. 

answered Nov 28, 2018 by Upasana
• 8,410 points

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