RFC: Constraints on Cash accounts

[Conrad Canterford]

All,

In Australia, physical cash (actual notes and coins) are limited to 
multiples of $0.05 by virtue of the fact that we have no 1c or 2c coins 
anymore. I'm sure a similar situation happens in other places.

This proposal is to implement a warning on certain accounts when those 
accounts are not an exact multiple of the constraint. There are a couple 
of ways this can be implemented:

1. As an option to  particular currencies, but only effective on 
accounts of type "Cash". This would mean that, if the currency has a 
constraint associated with it, any "Cash" account in that currency will 
display a warning if an amount is not a multiple of the constraint.
2.  On a per-account basis, with a multiple as an account option. This 
would enable it to be applied to any accounts regardless of currency as 
a user-setable option.

Option 2 is more general, but also a little fiddlier to implement. 
Option 1 satisfies all my requirements, but if Option 2 is preferred 
than that would be the better solution.

What do people think? Would either 1 or 2 be useful? What other 
currencies might this apply to?

Your comments please (either to the list or me directly).

Conrad.
-- 
Conrad Canterford  (conrad@mail.watersprite.com.au)
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