Seaquel
SQL Server error code

SQL Server error 6916

SQL Server raises error 6916 at severity 16, which marks a problem with the query or data that you can correct.

XML Validation: The content model of type or model group '%s' is ambiguous and thus violates the unique particle attribution constraint. Consult SQL Server Books Online for more information.
Msg6916
Severity16
Group6000–6999

Source: Database Engine events and errors