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Why do Studio-created relationships append "_1" to the name?

Question asked by danelige danelige on Jun 8, 2014
Latest reply on Jun 8, 2014 by raffle
When I create a new relationship between two custom modules in Studio, the relationship name comes attached with "_1" and I believe this is abnormal, perhaps indicating that the relationship is duped somehow. 

However, neither the custom/metadata folder nor the tables in DB show a dupe, just the "_1" relationship. 

Please advise why SugarCRM studio does that and is it an issue.