A DBMS trigger might prevent you from updating observations in a DBMS table. Refer to your DBA to determine if triggers are used in your DBMS tables. Some DBMSs require the SQL procedure's UNDO_POLICY ...

The SQL Procedure Pass-Through Facility is an extension of the SQL procedure that enables you to send DBMS-specific statements to a DBMS and to retrieve DBMS data. You specify DBMS SQL syntax instead ...