The MERGE statement attempted to UPDATE or DELETE the same row more than once. This happens when a target row matches more than one source row. A MERGE statement cannot UPDATE/DELETE the same row of the target table multiple times. Refine the ON clause to ensure a target row matches at most one source row, or use the GROUP BY clause to group the source rows.
Note You may still receive this error message when no duplicate rows are caused by the join operation.
For more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
Article ID: 976316 - Last Review: Jan 18, 2010 - Revision: 1