[Koha] GST and discount not calculating correctly when placing an order in 3.0 acquisitions.

[Joshua Ferraro]

On Sun, Dec 14, 2008 at 11:04 PM, Joann Ransom <jransom at library.org.nz> wrote:
> /(last one from me for the day I promise ..)/
>
> Greetings all,
>
> I have just placed an order for a book in my new Koha 3.0 test site.
>
> The supplier profile is set with list/ordering price and invoice price both
> inclusive of GST (12.5%) The supplier gives a 15% discount.
>
> I ordered a book with a List price of $75. (See attachment for the screen
> shots showing the input screen and the order details screen.)
>
> The amount to be deducted from the budget needs to be exclusive of GST and
> discount ie the actual net cost to us of purchasing the item.
>
> So RRP $75 less GST (divided by 1.125) =  a GST exclusive price of $66.66.
> Then if we deduct the 15% ($9.99) off the ex-GST price the book is actually
> $56.67.
>
> What appears to be happening is that Koha 3.0 then adds GST of 12.5% ($7.08)
> back on to the $56.67 to arrive at the $63.75 which is then deducted off the
> budget. This is the wrong amount.
>
> I think this may be a bug. Where does one log such things? And how do we
> incorporate a patch back into my demo site?
You can log bugs at http://bugs.koha.org.

> (PS We have used Koha acquisitions for 8 years and  are very familiar with
> the intricacies of it - by way of explanation for appearing so pedantic and
> obsessed about it!)
Yes, however, the version of Koha you're running doesn't match
released versions (whether by code or by templates). I think it's
great that you're looking to run off of a released version, and I hope
you're able to contribute the necessary bugfixes and patches so that
upcoming releases will incorporate all of the functionality you're
using -- I'm sure there are a lot of libraries in NZ and elsewhere
that use GST exactly the way you do.

Perhaps BibLibre can comment on whether the GST calculation described
above by Joann is the same GST calculation done in France? We don't
have GST in the US, so I can't comment on how it's calculated here.

Cheers,

-- 
Joshua Ferraro                       SUPPORT FOR OPEN-SOURCE SOFTWARE
CEO                         migration, training, maintenance, support
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