Seaquel
SQL Server error code

SQL Server error 4968

SQL Server raises error 4968 at severity 16, which marks a problem with the query or data that you can correct.

ALTER TABLE SWITCH statement failed. Target table '%.*ls' has foreign key for constraint '%.*ls' but source table '%.*ls' does not have corresponding key.
Msg4968
Severity16
Group4000–4999

Source: Database Engine events and errors