[Koha-bugs] [Bug 13321] New: Tax and prices calculation rewrite

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13321

            Bug ID: 13321
           Summary: Tax and prices calculation rewrite
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Acquisitions
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: jonathan.druart at biblibre.com
        QA Contact: testopia at bugs.koha-community.org

When all patches blocking bug 12826 will be pushed, all the plumbing part will
be done.
We will be ready to properly handle the prices calculation.

The idea is to create additional DB fields to store value tax included and tax
excluded.
For instance, for the ecost we will have ecost_tax_included and
ecost_tax_excluded.
On this way the calculation is done only one, on inserting/updating the order,
and not every time we need to display these values.
Note that the existing field will be kept, for 2 reasons: 1/ in some place in
the code, we just need to retrieve what the user has inserted and 2/ it will be
possible to go back if needed.
In the long term, they will be removed.

To be consistent, all occurrences of 'gste' will be replaced with
'tax_excluded", same for gsti.
On the way, gstrate will be replaced with tax_rate, gstvalue with tax_value.

Important note: It seems that the prices are generally correctly calculated (on
master), the only problem I found is inconsistency in rounding.
So we should not have a "migration problem" as I expected.

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