Seaquel
SQL Server error code

SQL Server error 6852

SQL Server raises error 6852 at severity 16, which marks a problem with the query or data that you can correct.

Attribute-centric column '%.*ls' must not come after a non-attribute-centric sibling in XML hierarchy in FOR XML PATH.
Msg6852
Severity16
Group6000–6999

Source: Database Engine events and errors