Shipping Labels not printing in Landscape format on Zebra GX420t printer

[Swadesh Katoch]

In R12 implementation, we are trying to print shipping labels in Landscape format to Zebra printer GX420t. It is a 2 page Landscape print.

xml publisher generate the pdf output in Oracle R12 , acroread through PASTA setup converts the pdf output to Postscript and then CUPS print server send the printout to Zebra printer.
If I download the PostScript (PS) file to my laptop and print directly to Zebra printer then I get the label in landscape format without any issue. But if I print directly from the Oracle R12 application through CUPS print server, it print only 1 page in Portrait format.

We are using CUPS version 1.3.7.
I am using 'Printer Driver: Zebra ZPL Label Printer, 1.3'

And in printer properties, I am using :
orientation-requested: 4

Thanks & Regards
Swadesh