Hello Jimmy,
I guess you have a JAA TR on your licence? And if you fly under a validation, then this is based on your JAA licence, which must stay current. Same for the JAA medical.
This is usually done and paid for by your employer, however, your JAA CAA may accept any ICAO LPC for licence renewal (putting a limitation on your rating that you may only fly aircraft registered to that company or country).
Very much depends on how flexible your CAA is (mine did the above) and where yoou are going.
good luck! IP