Hi Florian, this can be achieved by making the subform Flow direction as Western text.
Thanks for all your help Florian.. I have achieved my requirement finally.
After long hours of research and brain storming, the solution that I found was:
Along with making the form properties as Dynamic in Defaults and preview, I also had to pass 'X' in
SFPDOCPARAMS-DYNAMIC, when calling the form from driver program.