Get the last item added to RMS POS transaction Screen

I am creating an RMS Plugin to set the quantity of the
last item added by the cashier through add item.
The plugin works perfect but fails when the cashier
enter a wrong itemlookupcode, this causes the plugin
to change the quantity of a previously added item.
My question, How do i know that the item was added
successfully so that i can update the quantity since
additem hook is called even when the cashier enters
none existing itemlookupcode.
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