While encoding a new payment you receive this warning message.
Isabel will show this message if the BIC of your beneficiary, is not from a bank connected to the Swift network.
You can verify if a bank is connected to the Swift network by using the search on the website of Swift.com. (If the used bank is connected but not known by Isabel, it will be added during the upcomming month.)
Remark: If you encode a payment using a wrong BIC, the bank may count additional costs for this payment or reject it. Please contact your beneficiary in case you are unsure of the used BIC.