Hi ShelleyT, thanks for your question.
If multiple bills for the same supplier are included in one supplier payment, the remittance advice should list all invoices included in that payment. If only one is showing, please check that the invoices were selected together under the same payment transaction.
If they were, but the remittance still only shows one invoice, please contact our support team so the payment and remittance can be checked. You can also find more information here: Send remittance advices.
Regards.
Genreve