title: Multiple times purchase same InApp purchase
body: <p>I have developed game, and I have Coins, which users can buy from the Activity.</p>
  
  <p>Problem was, that when User purchases one, they can't purchase these more, because it shows error "Item Already owned".</p>
  
  <p>When user wants same amount coins with same price second time, and now this is not possible.</p>
  
  <p>(I am using Google Play Billing)</p>