> At this point, it is moot. You have a framework that works for you.

Martijn Tonies had a point about 'double-meaning', since this really
felt like a hack, although it works :).

> ... snip ...
> The "Discount Data Model" merges the two terms for markup/down into a
> single physical entity, which does not allow the possibility that all
> terms may apply for a given line item.

Ah. You're right.
If i understand you correctly, you mean in the case where a line item
can have BOTH fixed amount of discount AND a percentage rebate?. Never
thought about it because it wasn't in the requirement. This is
interesting. Thanks.

Regards,
sugi.