Go and dig out your licence and see who it is issued by.
It will state who issued it and under which regulatory standards.
Eg, mine states that it is issued by the UK CAA and it is issued in accordance with ICAO [and JAR-FCL] standards.
ICAO does not issue the licence, it sets the umbrella standards by which the issuing Authority follows.
So... to answer your question, you need to look at your licencing authority's specific regulations.