Seaquel
SQL Server error code

SQL Server error 356

SQL Server raises error 356 at severity 16, which marks a problem with the query or data that you can correct.

The target table '%.*ls' of the INSERT statement cannot be on either side of a (primary key, foreign key) relationship when the FROM clause contains a nested INSERT, UPDATE, DELETE, or MERGE statement. Found reference constraint '%ls'.
Msg356
Severity16
Group0–999

Source: Database Engine events and errors