Seaquel
SQL Server error code

SQL Server error 7899

SQL Server raises error 7899 at severity 16, which marks a problem with the query or data that you can correct.

The return value uses a data type not supported by SOAP. SOAP only supports data types supported in SQL Server 2005 or earlier.
Msg7899
Severity16
Group7000–7999

Source: Database Engine events and errors