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["Ferdinand @ Camptocamp" <868839@xxxxxxxxxxxxxxxxxx>]

may be this was a comment on the wrong place, nevertheless it's a shame
that we have to deal with such issues in this stade of the project.

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https://bugs.launchpad.net/bugs/868839

Title:
  Tax Rates Round to Decimal Precision of Account + 2 - Should be
  variable

Status in OpenERP Addons (modules):
  Confirmed

Bug description:
  In https://launchpad.net/bugs/667316 it was noted that tax percentage
  rates were limited to 2 decimals. As a "reasonable default" new code
  was introduced to fix this by changing that behavior to "use the
  decimal_precision of Account +2 for percentage values". While I can
  understand how this would work in most situations, we have just
  implemented an OpenERP system in Fresno CA where the local sales tax
  is in fact 7.975% (or 0.07975 when entered into OpenERP). Currently
  that rounds our rate to 7.98% given our Accounts are setup with a
  precision of 2. This does not calculate the correct tax amounts on our
  invoices (off by as much as a few dollars in some instances where the
  invoiced amount is large enough). We have no need for nor do we want
  our Accounts to round to anything beyond 2 decimals and the fix
  implemented in the bug above precludes using a tax rate such as the
  one noted that requires more than 4 decimal places (account +2 in our
  case is 4 but the rate we use needs 5).

  While I understand one can change the calculated tax value on the
  invoice, that is not behavior that I can expect of our end users on a
  regular basis. In the interim I have modified the code on our side in
  account.py to return account+3 instead of account+2:

  class account_tax(osv.osv):
      ...
      def get_precision_tax():
          def change_digit_tax(cr):
              res = pooler.get_pool(cr.dbname).get('decimal.precision').precision_get(cr, 1, 'Account')
              return (16, res+3)
          return change_digit_tax

  This works fine for me but I thought that since the previous bug noted
  Account+2 was a "reasonable default" that it should be just that... a
  default - which implies the decimal precision of the rate relative to
  the account precision should be variable and able to be set by the
  user. I personally believe that Account precision and Tax precision
  have nothing to do with each other and shouldn't be related in such a
  way to begin with. Shouldn't there be an actual entry in the
  decimal_precision table specifically for taxes that does not depend on
  and unrelated entities precision? Something like:

  class account_tax(osv.osv):
      ...
      def get_precision_tax():
          def change_digit_tax(cr):
              res = pooler.get_pool(cr.dbname).get('decimal.precision').precision_get(cr, 1, 'Tax')
              return (16, res)
          return change_digit_tax

  Just my thoughts.

  Current Environment:
  OpenERP 6.0.3 on Mac OS X 10.7 (the code above exists in the trunk as well)

  I'd be happy to help work something up if any one agrees or would find
  my suggestion to be useful.

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