Error: The constituent is already a registrant on this event - when a constituent registers additional guests via BBIS

When registering for an event, it is possible for a registrant to pay for additional guests.  When a registrant pays for additional guests via BBIS, a user may receive Error: The constituent is already a registrant on this event.  This is due to the registering constituent being included in the additional registration rather than an additional guest.  
1.  Edit your batch.
2.  Select your row that displays the error and click Review transaction details. 
3.  On the Guests tab, adjust each Registrant field to be Unknown Guest. 
4.  Commit your batch.  

Environment

 Blackbaud CRM
 4.0

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