Seaquel
SQL Server error code

SQL Server error 6917

SQL Server raises error 6917 at severity 16, which marks a problem with the query or data that you can correct.

XML Validation: Element '%ls' may not have xsi:nil="true" because it was not defined as nillable or because it has a fixed value constraint. %S_MSG %ls
Msg6917
Severity16
Group6000–6999

Source: Database Engine events and errors