Seaquel
SQL Server error code

SQL Server error 6998

SQL Server raises error 6998 at severity 16, which marks a problem with the query or data that you can correct.

Invalid type definition: Type or content model '%s' is too complicated. It may be necessary to reduce the number of enumerations or the size of the content model.
Msg6998
Severity16
Group6000–6999

Source: Database Engine events and errors