Birt Reporting PDF rendering issue

Question

I am using Birt 2.3.1.

While rendering it on PDF the format is not appropriate.

For report we are having Pagination of 20 On HTML it renders fine. But when it is rendered on the PDF it displays 12 rows in one page and remaining 8 on the other.

I want my all 20 rows in one page itself or if any one has any idea whats the ideal way to do it as the pagination level is dynamic in my application. it varies from 10 to 100.