DocuRef in report issue

Hi all expert, currently I’m facing this problem:

One of my end user had type about 30 line in document handling and when printed in PackingList it’s out of margin.

I know the call of element.newPage() but just that dunno how to separate the line into 2 pages.

Means that my 1st page showing 25 line and 2nd page show the remain 5 line. How can i do that?