You should be running FMP 6.0v4, not 6.0v1.
See the downloads page:
http://www.filemaker.com/support/updaters.html
I have never had a problem with whose clauses in FileMaker Pro going
all the way back to Version 3.0.
Use the syntax that I showed, and I believe it will work.
Steven
--
Steven H. Blackwell
Partner Member, FileMaker Solutions Alliance
_________________________________________
"The commitment of our Fathers is now the calling of our time."
_________________________________________
The New http://www.FMP-Power.com
One Hundred Thirty Six Countries of FileMaker Pro!!