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Well, to answer that, it would be useful to know your OS and version, e.g RHEL 6.1

Can you show us the content of /etc/cups/ppd/qlp30.ppd

From the RHEL manual page for lpadmin the -P option is...

I suppose that there could be printer filters involved here or defaults on the physical printer. You don't give us much detail to go on.

You are using cups which means it's pretty unlikely to be...

If the printer supports postscript, you might try using pdf2ps first, then sending the postscript file to the printer.

You can't send a pdf file to the printer using lpr, unless the destination print driver has the ability to convert pdf to a print stream suitable for the printer.
If your printer supports...

Assuming that the printer has two input trays, one for A4 and one for letter size.
Does the installed print driver use the correct command (pcl5?) to select the A4 tray.
I once phoned HP and asked...