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PROCEDURE validate_user ( 
    p_event            IN    EVENT,
...
    p_password_only        IN    boolean,
    v_return_string        OUT    VARCHAR2)

#!/usr/bin/perl

...
print $error_string." : ".$return_code."\n";

$dbh->disconnect;

DBD::Oracle::st execute failed: ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'VALIDATE_USE
+R'
...
PLS-00306: wrong number or types of arguments in call to 'VALIDATE_USE
+R'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored (DBD ERROR: OCIStmtExecute)