Error: A guest is already a registrant on the event with a host different than the selected donor - when committing a BBIS Event Registration batch

When an existing constituent registers for an event in BBIS, a user can then download that transaction into a BBIS Event Registration batch in Blackbaud CRM.  The user may receive the error below when attempting to commit the batch:

A guest is already a registrant on the event with a host different than the selected donor.

This occurs even if validating the batch does not return any errors.
 
Download and install the latest service pack, which contains all fixes from previous service packs. If you are running an older version, download and install the latest version and then the service pack. 

Environment

 Blackbaud CRM
 3.0
 3.0
 Service Pack 10
 3.0.516, patch 37

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