How to process payments from parent customer for child customer invoices through lockbox

Hello Oracle Community

We are implementing standard Oracle lockbox and have a scenario where a payment/check comes in from a corporate HQ with the remittance amount and check number and the HQ MICR number, and we enter this information in the lockbox file in the Payment record 6. But then this check is supposed to be for a child customer invoice, so if we put the child customer # and invoice # with the applied amount in the overflow record 4, then we get an error during the validation saying that MICR # is not for the customer #. So should we then