Customers with more than one Dejavoo EMV reader can refund transactions from the POS device connected to the EMV terminal that was used to process the transaction initially.

If you are trying to refund a transaction but do not see it on your POS, or you cannot complete the refund action on your POS, this means that the transaction was not processed initially on that POS's EMV terminal. 

Check a POS device connected to another terminal at your location and complete the refund from there.