"Check Digits" on a Supplier Bank Account Record in BIP SQL TABLE location

Hi Guys

Does anyone know please which BIP table contains the field "Check Digits" for a supplier bank account?

I need to get the checkdigits field for a supplier bank account when a payment is made so need to join the table containing "Check Digits" somehow to one of these tables so I can grab the value when a supplier payment is made.

ap_inv_aprvl_hist_all aiaha
ap_invoices_all aia
iby_payments_all ipa
ap_invoice_payments_all aipa
ap_checks_all aca
iby_pay_service_requests ipsr
per_users apprvpu
per_person_names_f_v apprvper