SQL> set serveroutput on size 1000000
SQL> exec dbms_output.put_line ('TEST')
TEST
PL/SQL procedure successfully completed.
SQL>
Now in PL/SQL developer (v 5.1.6.747) with same user running (as an example) "select count(*) from dual", I get an error box with:
ORA-06550: line 3, column 9...