Question Samsung can't process a rebuy of non-consumable item

Hello.

I use IAP and UDP without problems and sell one non-consumable product called "premium".
The app on Google Play Store is ok: If a user uninstall the APP and reinstall it, the purchase process is automatically trigged.
And if I press the button to buy the product, an error message is posted "You have already it".

I've fixed that on MyIAPManager.cs with this simple patch:
If (failureReason==PurchaseFailureReason.DuplicateTransaction){ CALL_PURCHASED_COMPLETE_FUNCTION } else { CALL_PURCHASED_FAILURE }
..and it perfectly works with Google Play!

PROBLEM IS with Samsung: When users uninstall and reinstall the game, the purchased process isn't triggered.

If users try to rebuy, they have an error message: "Couldn't complete purchase Already purchased" But my patch on MyIAPManager doesn't work with Samsung.

What's' wrong?

Thank you!

Regards



Eros Cappello