Seaquel
SQL Server error code

SQL Server error 3103

SQL Server raises error 3103 at severity 16, which marks a problem with the query or data that you can correct.

A partial restore sequence cannot be initiated by this command. To initiate a partial restore sequence, use the WITH PARTIAL clause of the RESTORE statement and provide a backup set which includes a full copy of at least the primary data file. The WITH PARTIAL clause of the RESTORE statement may not be used for any other purpose.
Msg3103
Severity16
Group3000–3999

Source: Database Engine events and errors