Error: Data could not be saved.The UPDATE statement conflicted with the CHECK constraint "CK_REGISTRANT_VALIDCONSTITUENTID" The conflict occurred in database <Database Name>, table "dbo.REGISTRANT" when merging two constituents

When attempting to merge two constituents, a user may receive  the error:  

Data could not be saved.The UPDATE statement conflicted with the CHECK constraint "CK_REGISTRANT_VALIDCONSTITUENTID" The conflict occurred in database [database name], table "dbo.REGISTRANT".  
This was a conversion issue based on the registrant being registered for a single event multiple times.  To correct the issue, review the events that both constituents are registered for to locate and delete the additional registrations.

Environment

 Blackbaud CRM

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