If an invoice is flagged as ‘Discrepant’, it means there’s been an issue during the matching process where it’s compared to the purchase order and logistics documents (if applicable) and matched against the rules you have in the agreement with your buyer.
You can either amend that invoice to re-present or ask your buyer to review the discrepancy and apply an adjustment i.e. a discount on the invoice value. Depending on their response, your invoice status will either change to ‘Approved’ or ‘Accepted’ with or without an adjustment before it’s processed for payment.
In the unlikely event your buyer rejects an invoice, it would then be closed and no payment would be made against it. In this situation, your buyer would let you know why it’s been rejected and any next steps to take.