A report page can have any length and any width. Because printer pages may be smaller or larger than your paper reports page, the concept of physical and logical pages is used. A physical page is the size of a page that is output by your printer. A logical page is the size of one "conceptual" page of your report; one logical page may be made up of multiple physical pages.
For each section (header, main, trailer) of a report:
you specify the dimensions of the physical page (including the margin) using the Width property and Height property.
you specify the dimensions of the logical page (report page) in physical pages (printer pages) using the Horizontal Panels per Page property (width) and the Vertical Panels per Page property (height). For example, a Horizontal Panels per Page size of 1 means that each logical page is one physical page wide, and a Vertical Panels per Page size of 2 means that each logical page is two physical pages in height.
In this example, one logical page is made up of six physical pages. The logical page is three physical pages wide and two physical pages high. Consequently, Horizontal Panels per Page size is 3 and Vertical Panels per Page size is 2. If you wanted the logical page to be two physical pages wide and three physical pages high, you would specify a Horizontal Panels per Page size of 2 and a Vertical Panels per Page size of 3.
About the report unit of measurement
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