Call API to create new customer e-mail at party site level but error contact_point_id must be uniqu.

I want to create new e-mail at party site level. I call API hz_contact_point_v2pub.create_email_contact_point but got error that "Value for contact_point_id must be unique."

l_contact_point_rec.contact_point_type     := 'EMAIL';

l_contact_point_rec.owner_table_name       := 'HZ_PARTY_SITES';

l_contact_point_rec.status                 := 'A';

l_contact_point_rec.owner_table_id         := l_owner_table_id;

l_contact_point_rec.primary_flag           := 'Y';

l_contact_point_rec.content_source_type    := 'USER_ENTERED';

l_contact_point_rec.contact_point_purpose  := 'INVOICE';

l_contact_point_rec.primary_by_purpose     := 'N';