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["Ronald Portier \(Therp\)" <ronald@xxxxxxxx>]

** Also affects: therp-backports
   Importance: Undecided
       Status: New

** Changed in: therp-backports
     Assignee: (unassigned) => Ronald Portier (Therp) (rportier1962)

** Changed in: therp-backports
   Importance: Undecided => High

** Also affects: therp-backports/addons-6.1
   Importance: High
     Assignee: Ronald Portier (Therp) (rportier1962)
       Status: New

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https://bugs.launchpad.net/bugs/1058390

Title:
  Wrong base amount of taxes in OpenERP 6.1

Status in OpenERP Addons (modules):
  Fix Released
Status in Therp Backports:
  New
Status in Therp Backports addons-6.1 series:
  New

Bug description:
  Anevia has discovered that OpenERP 6.1 doesn't compute correctly the
  "base" amount of taxes ; as surprising as it may seem, the tax amount
  is correct.

  This bug is present in OpenERP 6.1 (not in OpenERP 6.0) with an up-to-
  date codebase.

  Here is a detailed scenario to reproduce the bug :
  1. Create a new DB with demo data
  2. Install the module "account_accountant"
  3. Activate "Extended view"
  4. Create a new customer invoice for the partner Agrolait in EUR currency
     Add an invoice line with :
     - Product = HDD1 (could be any)
     - Quantity = 100
     - Unit price = 0.56
     - Discount = 15%
    (if you have a tax, check that it's NOT a "tax included" one)
  5. Click on compute tax : you will see that :
    * The total untaxed amount of the invoice is 47.60
    * At the bottom left, in the invoice tax lines, there is one line ; in this line, the "base" amount is 48.00 !
    => These two amounts should be identical ; that's the bug.

  The cause of the bug is the following :
  * the "price_subtotal" of the invoice line is computed that way :
    1. (quantity * unit price) * (1-discount/100) = 47.60000  (cf line 1272 of account_invoice.py)
    2. Round at the precision of the EUR currency = 47.60 (cf line 1277 of account_invoice.py)

  * but the "base" amount of the invoice tax line is not computed the same way :
    1. price_unit * (1-discount / 100) = 0.47600  (cf line 1588 of account_invoice.py)
    2. Round at the precision of the EUR currency = 0.48  (cf line 1589 of account_invoice.py)
    3. Multiply by the quantity : 0.48 x 100 = 48.0 (cf line 1596 of account_invoice.py)

  I have written a patch that makes OpenERP compute the "base" amount of
  invoice tax lines with the same method as the "price_subtotal" of the
  invoice line. I enclose the patch to this bug report.

  In fact, this bug was introduced in the branch addons-6.1 by the
  commit 5569 dated 2011-11-10, cf http://bazaar.launchpad.net/~openerp
  /openobject-addons/6.1/revision/5569. This commit was designed to fix
  this bug : https://launchpad.net/bugs/887367. I have tested the
  scenario of this bug report to see if my code re-introduces this bug ;
  it's not the case.

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