lp printer not printing multiple copies

I'm trying to print multiple copies of a file on sun solaris 8 with the lp -n command to no
avail. No matter what numeric value I supply -n, I still only get 1 copy
of the file printed.

The command I'm using is 'lp -d SNY_IT5000-2 -n2 file'

The printer is an HP Laserjet 4000 with a Jetdirect card. My printers.conf
entry is:

SNY_IT5000-2:\
:bsdaddr=10.10.21.17,10.10.21.17,Solaris:\
:description=SNY_IT5000-2:


Printing in this manner works fine otherwise, it just won't print multiple copies.

Can you help please?

Thanks in Advance