Please, i need to know how to set the number of columns per page in RML which i used to create reports for my Openerp session. I have tried this but it does not work at all. so i need your help please who can help me know.

either this:

<condPageBreak height="5cm"/>

<frame id="first" x1="57.0" y1="57.0" width="481" height="728"/>

Thanks a lot in advance.