Function returning error - change notification

Question

I have a function returning error text. When error occurs I get the message
'xx error has occurred' on the screen (in notification). Is there a way to control the message text so I can display different text?

Answer 1

It's something like this:
DECLARE l_code zip.code%TYPE;
got_error varchar2(1) := 'N';
l_check_fld varchar2(30000);
l_error_fld varchar2(32000);
vErrorFields varchar2(1000);
CURSOR check_zip IS
select ''
from zip
where code = l_code;
BEGIN
apex_collection.create_or_truncate_collection('ZIP');
FOR i IN 1 .. apex_application.g_f03.COUNT LOOP
vErrorFields := '';
/* Code MUST be entered */
if (apex_application.g_f03(i) is null and
(apex_application.g_f04(i) is not null or
apex_application.g_f05(i) is not null))then
got_error := 'Y';
vErrorFields := vErrorFields || ',f03';
l_error_fld := l_error_fld || 'Row ' || to_char(i) || ':' ||' <span style="color: red">Code cannot be <strong>blank.</strong></span><br>';
end if;
END LOOP;
if got_error = 'N' then
apex_collection.delete_collection('ZIP');
end if;
RETURN l_error_fld;
END;