A Greek ship owner transports mouse traps from Albania to Japan, making every year ten million Euro in revenue and one million Euro in profits.
The total value of the mouse traps he transports every year is one hundred million Euro. So Albania is exporting one hundred million Euro every year. The ship owner charges 10% of the value of the goods, making a revenue of 10 million Euro (Albanians are paying him that money for transporting the goods to Japan). After paying his expenses: fuel, food, ship repair, taxes, etc., he gets one million Euro in profits.
The question is: does his revenue count as a Greek export? One can argue that Greece is exporting a transporting service so it should count as Greek export. Also the revenue should count as Albanian imports since they pay an external company for the service.