Its intentional, just like in oxwall store - you can't review your own items. And admins can do everything, because they know what they do :)

Is it possible to enable this?
My members don't sell anything.

I'll give you an example.  My site is a home schooling community, where parents get together and meet for events, join groups etc.  A large part of it is discussing educational topics, such as books, apps, tutors, events, medical specialists etc.

So parents want to be able to share their experiences with the community.  This means that parents have to add their item to the catalog, copy the description from a website, BUT the important part is that they want to review it after they have written up the description for the item.

I thought this was possible.  Is there a way to make an update that could enable this option with a checkbox in the admin section?

I understand it makes sense not to have it when you have the creator or author setting up the item.
But on our site everything that will be added is done by a third party, not the author or creator of the product(s). 

Pleeease? 

I actually told this to my members, because I thought that's what they could do.
When I did a test item as the admin, of course I was able to, so I thought they could, too.

I'm still thinking of such feature need to be added for all users, but i'll send you special modified version in a couple of hours

Wow,ok.  Thank you!