APEX

Hi guys,

I'm trying to make a simple page validation to check an item in my tabular form if it is a number or not:

BEGIN
FOR i IN 1 .. apex_application.g_f12.COUNT
LOOP
IF LENGTH(TRIM(TRANSLATE(apex_application.g_f12(i), '0123456789',' ')))is NOT null
THEN
RETURN FALSE;
END IF;
END LOOP;
END;

but i keep getting this error if g_f12= AAA :

ORA-06502: PL/SQL: numeric or value error: character to number conversion error
Error ERR-1021 Unable to run "function body returning boolean" validation.
OK

if g_f12 = A12 or any mixed alphanumeric it will work!!!

*( i've tried this with function returning text and it works like a charm but in this case i have to use function returning boolean to enable me to translate the error message)*

am i doing somthing wrong please help

Thank You