Print your file to Postscript: in Printer options after selecting 'Print to File' and paper size.
Open the resulting *.ps file in Gimp and then 'Save as' *.pdf
If you are using M$ Software the method may be a bit different, however basically similar I think.
I don't have a problem with printing to PDF,
my problem is that the reference numbers (U1, U135, etc'...) change whenever I print it to PDF...
Also, as I wrote, I tried it with three different programs: PDFCreator, PDF995, and cutePDF (the program that was suggested in the thread you suggested)
Thanks anyway, but not really what I'm looking for
Did you ever encounter a problem like the one I described?