After using the lite version I paid for the upgrade to the premium version but in Google Play Store I'm classed as having the lite version. I can't enter a review into the premium version as Google Play says I don't have that version. Only slight annoyance but it makes me feel like I don't have the premium version although I do :(
Yep, as far as google is concerned, they are two totally separate apps. If you've installed the lite version and then made the in-app purchase, you should be able to comment on the lite version of the app.
Is that not possible?
Yup, it is possible. I just feel excluded somewhat. I guess it's Google's fault not yours :)