Interesting. I don't think it's a matter of the tab order as much as it is the extension field is disabled from manual input. Without discounts the formula for the extension is simply unit price x quantity and the system will let you actually override the extension and recalculate the unit price automatically. With discounts enabled the formula for the extension is (unit price - discount%) x quantity and the system does not let you override the extension and recalculate the unit price automatically. It would appear this is under program control so you probably can't change this with custom office. That being said I'm not sure why you couldn't back compute the unit price anyway. Maybe it just doesn't make much sense to be overriding the extension when a discount is in play??
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