Where the validity of an assignment of a cause of action is disputed and the opposing party refuses to admit the assignment, joinder of the assignee as an additional plaintiff under Rule 9.06 is the appropriate course rather than substitution, with claims to be pleaded in the alternative. Rule 9.06 and Rule 9.09(2) provide overlapping powers and joinder is not excluded merely because substitution may be more appropriate in a given case.
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