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Error: Join cannot be based on a 1-many relationship class

Error Message

Joining data to a table or layer through a relationship class returns:

"Join cannot be based on a 1-many relationship class"

Cause

You cannot create a join based on a one-to-many (1-M) relationship class from the one side.

Solution or Workaround

Create the join from the many side or, if the data is one-to-one (1-1), create a one-to-one relationship class.