Seaquel
SQL Server error code

SQL Server error 1971

SQL Server raises error 1971 at severity 16, which marks a problem with the query or data that you can correct.

Cannot disable index '%.*ls' on table '%.*ls'. Permission denied to disable foreign key '%.*ls' on table '%.*ls' that uses this index.
Msg1971
Severity16
Group1000–1999

Source: Database Engine events and errors