I think Duncan's point was that the DefaultQuantity entry in the quantity box can't be changed to 0 by changing the minimum qty orderable to 0 because you can't.
ermmm..I know what I mean!
ermmm..I know what I mean!

not me......and no, he wants it at 0
not me......and no, he wants it at 0 
) and in the absence of a way to change the DefaultQuantity variable itself to zero, what's wrong with replacing the DefaultQuantity variable with a 0 digit instead in the layout?
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