Just for reference:
Did my flight training for both FAA and JAA. When I started logging time in the EU in 2000, I was able to log my first 500hrs SIC, and the first 500hrs SIC with MTOGW over 20K Kgs, and 50% of other SIC time as PIC time towards my required 1500hrs PIC for the purpose of unfreezing my ATPL. I also had to log the Out/In times and the name of the PIC for every leg. Needless to say I rewrote all my logbooks, except the one for my primary training when I came over to the states, logging everything in the right seat until EU upgrade OE was finished as SIC.