In an announcement on Google+, Google said that they are adding more to the Products tab to show policy details about why your products are inactive or disapproved.
Google said, “Disapprovals can impact the success of your campaign. Identify which of your top products are disapproved or inactive, and see how you can resolve the issue as soon as possible:
+ Add the Shopping column “Product status” and the column “Conversions” in the Products tab of your Shopping campaign
+ See your top selling products by sorting on the conversions column
+ See which top selling products are disapproved or invalid, then use the policy details to see the reason and how to resolve the issue by clicking on the 'How to fix' link”