'Product list display type' tab not showing in manage display section of variation types

I need to manage the display of the product list. when I go into content types > manage display there is the grey tab for 'Product List' which I can manage here, however my content type for products has a cloud zoom and gallery image which shows up on the product list pages.

The image field on manage display for the content type says 'Modify the settings for this field on the product variation type "manage display" configuration.'

however when I go to variation types and manage the display, there is not a grey tab for 'product list' there are only the following tabs:

add to cart confirmation view
product in cart
line item
Node: Teaser

Thank you for any help

Posted: Nov 26, 2013