Discount current item NOT entire Transaction

I have a auto-discount 10% button that I only want to work on current-item. BUT if cursor is any where else except the line, then the button will 'activate' a 10% discount on entire Transaction(but cashier is unaware of what they have done) and now all items are discounted 10%... I've tried using 'Security' to disable transaction wide discount but to no avail. Is there some other way to solve problem?

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