Oracle Forms

Hi all

I'm developing a form(in 6i) to insert data to my table through the form insert option, i'm having check constraint in my table and using data block, while creating the data block i selected 'Enforce Data Integrity' option

My Table Is

CREATE TABLE contacts
(
l_name VARCHAR2(30),
p_number VARCHAR2(30)
CONSTRAINT p_number_format
CHECK ( REGEXP_LIKE ( p_number, '^\(\d{3}\) \d{3}-\d{4}$' ) )
);

My scenario Is

I don't want to write any validation in the form level bcz I used 'Enforce Data Integrity' option during designing the data block and i'm having the constraint at table level, if i enter the value for p_number in wrong format it won;t inserted due to the CHECK CONSTRAINT(Enforce Data Integrity)


Problem is

I designed the data block, it automatically creates a 'when-validate-record' for the item p_number as
(automatically generated code due to 'Enforce Data Integrity' option)
--
-- Begin default enforce data integrity constraint P_NUMBER_FORMAT section
--
if not( REGEXP_LIKE ( :CONTACTS.P_NUMBER, '^\(\D{3}\) \D{3}-\D{4}$' ) ) then
message( 'WHEN-VALIDATE-ITEM trigger failed on field - ' || :system.trigger_field );
raise form_trigger_failure;
end if;
--
-- End default enforce data integrity constraint P_NUMBER_FORMAT section

--

while complie it throws the error

Error 201
Identifier REGEXP_LIKE must be declared

How to solve this error

Help me