This is nit-picky, and I've already sent an e-mail to Wrox, but I just found this forum and figure that this is a better place to note this problem.
The word "it's" is misused throughout the book. For example, at the top of page 57 ("Report Design Basics - Report Sections") it says, "You can choose to suppress a section if you don't want to it to appear, or change it's appearance by adjusting the color or size of the section, based on your needs."
"It's" means "it is." The possessive form is "its."
Now, this isn't a big deal, and sadly more and more people are making this error. Nonetheless, it's jarring to some readers, and is simple to solve with a pass through a grammar checker.
B P Fraser
Sauder Information Systems