Martin1234: The following 9 countries have as per 1st July been "recommended for mutual recognition" for JAR-FCL 2 licenses (Helicopters) by the JAA:
Czech Republic, Denmark, Finland, Germany, Iceland, Netherlands, Norway, Sweden and UK.
However, it is fully up to the national CAAs to decide if and when to actually do so.
The transfer of licenses is regulated in JAR-FCL 2 item 2.065 (c):
For administrative convenience, e.g. revalidation, the licence holder may subsequently transfer a licence issued by the State of licence issue to another JAA Member State, provided that employment or normal residency is established in that State (see JAR–FCL 2.070). That State would thereafter become the State of licence issue and would assume the responsibility for licence issue referred to in (a) above
However, such transfer is a matter between the licence holder and the two authorities involved. Observe the word "may" in the quote above. The question should therefore be directed to the CAA of Netherlands.
Cheers,
RedBar1