crystal report new page

Hi

I am using crystal report 11.
I have designed a report that prints on 2 pages
this report has 2 sections:Report Header and Report Footer.
In section1 (Report Header a) there are multiple subreports that are designed to print on one page,but sometimes they print on 2 pages.Is there a way to prevent a page break so that all the subreports of Report Header a print in one page?

(Note that I tested my report and it was right,when i send it to the customer the page break inside Report Header a occurs,so is there a way to prevent it?)

thanks