My app seems ready to get a \'real life\' test for an in-app purchase procedure on my device. However, I receive an \"The publisher cannot purchase this item\" error message in
You are trying to purchase that item using the same account that you used to upload the app to the store.
If you upload an app on the android store using abc@gmail.com and you try to make a purchase on that app using abc@gmail.com you will get that error.
Try making the puchase using another Google play-store account, on someone else's phone for example.
Bottom line: You can't purchase it yourself.