Even if an ASIN belongs to 'n' number of nodes, It should be only one Product page.
example: from demo.affiliatenichescipt.com, below are the example here with same product listed under 3 different categories:
http://demo.affiliatenichescript.com/p/Books/0679725164/detail/No-Exit-and-Three-Other-Plays.php
http://demo.affiliatenichescript.com/p/Fiction/0679725164/detail/No-Exit-and-Three-Other-Plays.php
http://demo.affiliatenichescript.com/p/Drama/0679725164/detail/No-Exit-and-Three-Other-Plays.php
The above pages included the category to which it belongs and resulting in duplicate pages. To avoid these duplicate pages, in the '/admin/settings-seo.php' page, i have selected Category to 'None' and able to 'GET RID OF DUPLICATE PAGES'.
Now the problem is because the Category is Set to 'None' in the the '/admin/settings-seo.php' page, the Breadcrumb navigation above the center column is not showing the category when viewing the product page. When viewing the product, the Breadcrumb is simply showing only 'Location: Home' not showing subsequent categories. It should show the category from where i selected the product to view.