Seaquel
SQL Server error code

SQL Server error 6969

SQL Server raises error 6969 at severity 16, which marks a problem with the query or data that you can correct.

ID/IDREF validation consumed too much memory. Try reducing the number of ID and IDREF attributes. Rearranging the file so that elements with IDREF attributes appear after the elements which they reference may also be helpful.
Msg6969
Severity16
Group6000–6999

Source: Database Engine events and errors