Seaquel
SQL Server error code

SQL Server error 1784

SQL Server raises error 1784 at severity 16, which marks a problem with the query or data that you can correct.

Cannot create the foreign key '%.*ls' because the referenced column '%.*ls.%.*ls' is a non-persisted computed column.
Msg1784
Severity16
Group1000–1999

Source: Database Engine events and errors