[Koha-bugs] [Bug 10461] tax not taken in to account in the acq budget summaries

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=10461

--- Comment #14 from mathieu saby <mathieu.saby at univ-rennes2.fr> ---
(In reply to Katrin Fischer from comment #13)
> Hi Mathieu - maybe we need to start a wiki page for that. Without a clear
> specification, those bugs will be hard to fix :(

I can try to write something, but I don't know if I have rights to create a
page.
Some ideas it may be usefull to list :
- the different columns for prices in aqorders and their meaning (listprice,
ecost, unitprice) + discount + tax rate
(maybe also prices in records in a 2d time)
- the different settings for vendors and their meaning
- the different settings for currencies
- the pages (not forgetting pdf and csv export) displaying prices (not to
forget some of them is a patch is made for altering general price management)
- maybe the subs in C4 handling prices
- Which prices stored in database Koha must calculate, when and how
- Which prices must be visible in staff interface, when and how to calculate
them
- arithmetic details : how much decimals are taken into consideration in the
calculations? what kind of "rounding" is made in the final price displayed or
store in db (15.005 => 15 or 15.01 ?)

For example : in a detailed order create by hand, 
-> the user enter a price (could be with or without tax)
10 EUR
-> this input is saved in DB as listprice (is it usefull?)
(I think a correction is made depending on currency at this step. not sure)
-> rrp tax exc. and tax. inc are calculated depending on listprice and the
preference "list prices include tax" of the vendor
for ex : rrp tax inc = 10.55 EUR
-> rrp (which one : tax inc., or tax exl, or depending on vendor preference?)
is saved in database in rrp column
-> rrp tax INC (or also tax exc. but it must be clear) is displayed on screen
-> ecost (tax inc.? tax exl?) is calculated depending on rrp tax inc., the
discount and the preference "invoiced prices include tax"
etc

It would be long and tedious, but I am sure it could be usefull for fixing
bugs, avoiding future regressions, and make easier future enh.

Mathieu

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