Is it possible to program our barcode scanner to produce an "error" beep/sound when an item scanned is not found in the inventory? It currently brings up a screen to add a new item.
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Your question is similar to http://devask.clover.com/question/150 . The current behavior of bringing up the add item screen cannot be changed. However I have created an internal ticket to look into this behavior and see if we can introduce some kind of customization in the future.
For now if you are developing your own app you could register for the Barcode intent using the BarcodeResult.INTENT_ACTIONin https://github.com/clover/clover-andr... , then you could do an inventory lookup to see if an item exists and if not play a beep sound and/or show a popup saying item not found.