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["Amit Bhavsar \(Open ERP\)" <900809@xxxxxxxxxxxxxxxxxx>]

Hello DR Ferdinand,

I have completely checked your bug report, But this is not a bug but
rather than it's your suggestion to do not use account move lines for
it.

For the issue of migration, I think it will not appears because in v6.0 we do not have this module.
Account_asset are currently new implementation for Trunk (as well as new version).

We can consider this is as your suggestion, so we are considering it as a "Wishlist".
But currently we can not fix it , So setting it as a "Won't fix".

Thanks for the reporting!

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https://bugs.launchpad.net/bugs/900809

Title:
  account_asset - do not use account_move_lines

Status in OpenERP Addons (modules):
  Won't Fix

Bug description:
  the assumption that historical account_move_lines are available is far
  from reality.

      def _amount_residual(self, cr, uid, ids, name, args, context=None):
          cr.execute("""SELECT
                  l.asset_id as id, round(SUM(abs(l.debit-l.credit))) AS amount
              FROM
                  account_move_line l
              WHERE
                  l.asset_id IN %s GROUP BY l.asset_id """, (tuple(ids),))
          res=dict(cr.fetchall())
          for asset in self.browse(cr, uid, ids, context):
              res[asset.id] = asset.purchase_value - res.get(asset.id, 0.0) - asset.salvage_value
          for id in ids:
              res.set

  solution (alternatives)
  * the historical depreciation lines must be stored for each asset ( IMHO many migrations will not be possilbe using this method becasuse of lack of historical data.)

  * the depreciation must be calculated 
   book value of the previous year / remaining periods.
  this works always and allows extraordinary modification of book values and remaining periods  - which sometimes is required by tax authorities.
   obviosuly book values of preceeding years can be stored, but it's not a requirement and only necessary if reopening of previous years is necessary.

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