If we have all products on-site for indexing, do we get dinged by Google for not transacting on-site?

[KaylaV]

I am trying to do research on the SEO impact of having an off-site transactional website. For example, Pepsi.com lists all product information on their site but guides visitors to transact on Amazon or Walmart.

What impact, if any, does guiding the customer to a separate transactional site have on SEO? In short, if we have all products on-site for indexing, do we get dinged by Google for not transacting on-site?

[JamesCrossland]

The only issue I could see would be how different your 'product' pages are to your off site transaction pages. I'm thinking duplicate content issues. As long as teh content is different on each though I can't see any issues personally