Group Owned Object

I don't really get how this option works. What i would like to do is: make an object (more than one prim most of the time and linked), make it group owned and sell its content.

From what i know that is when a group owned object is sold, its money goes into the "group accont" and it is divided up amongst the group members - which is exact what ideal in my case.

So here is what i got:
1) i've made the object, filled its content with the things i wanna sell.
2) Under the EDIT > GENERAL tag, i've set "Share with group" and "Deed".
3) Set the "For Sale with some amount of L$, and "Contents".
4) Next owner can only "Resell/Give away.

Then when someone else who is not in the group chooses the "buy" button from the object's pie menu, its content is empty (which supposes to have the content i want to sell in it). Thus this person can't confirm the purchase.

But when back to the object's owner's EDIT menu, it definitely shows that there ARE things in its content.

Can someone advise how does this happen?

Appreicate any help