Validation help required

Question

I have a Region where there are 2 fields.
Field A is a "Text field" Item where a user enters a number.
There is also a validation of "Item type is numeric" on the text field item to ensure a number is entered.
Field B is a "Display as text item" that takes the number input by user from Field A and translates the number to metric via a PL/SQL function call after the "Apply Changes" button is pressed.
If an alphabetic character is entered into Text field A by the user and the apply changes button is pressed, my inline error message is displayed(desired) however there is also a pl/sql error:
"ORA-06502: PL/SQL: numeric or value error: character to number conversion error
Error ERR-1020 Error in PLSQL item processing (function)." (along with the familiar red stop sign with X in middle)
How can I avoid having the Oracle PL/SQL error message appearing?
How can i set up the first validation to avoid passing a non-numeric to the second field?
I tried adding a second "item type is numeric" validation on the 2nd item but i still get the PL/SQL error message displayed and a second inline error message is displayed.
Any help would be much appreciated.

Answer 1

George,
You could use PL/SQL returning boolean and do something like this:
DECLARE
number_test NUMBER;
BEGIN
number_test := to_number(:P1_MyField);
return TRUE;
EXCEPTION
WHEN OTHERS THEN
RETURN FALSE;
END;
Chad