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Page Attributes for the Book Page 
Use the tab page Page Attributes to define the necessary page attributes for the book page
showbook.htm.
The attribute
s_bookdata corresponds to the general structure BSDOOKDATA in the SAP System. This is the structure for transferring all relevant data for a book. It is used on this page to display detailed information for a selected book.The attribute
s_cata_id is used across all pages as an index for a particular book in the catalog. This index identifies the selected book for which detailed information is required.