[FIX] account: filter taxes

In a multi-company environment, a user from company A which is a parent
of the company B has access to taxes from both companies. The
consequence is that the method _set_taxes will automatically add the
taxes from both companies.

addons/account/models/account_invoice.py

@@ -5,7 +5,7 @@ from lxml import etree
 from datetime import datetime
 from dateutil.relativedelta import relativedelta
 
-from openerp import api, fields, models, _, SUPERUSER_ID
+from openerp import api, fields, models, _
 from openerp.tools import float_is_zero, float_compare
 from openerp.tools.misc import formatLang
 
@@ -1093,8 +1093,11 @@ class AccountInvoiceLine(models.Model):
             taxes = self.product_id.taxes_id or self.account_id.tax_ids
         else:
             taxes = self.product_id.supplier_taxes_id or self.account_id.tax_ids
-        if self.env.uid == SUPERUSER_ID:
-            taxes = taxes.filtered(lambda r: r.company_id == self.company_id)
+
+        # Keep only taxes of the company
+        company_id = self.company_id or self.env.user.company_id
+        taxes = taxes.filtered(lambda r: r.company_id == company_id)
+
         self.invoice_line_tax_ids = fp_taxes = self.invoice_id.fiscal_position_id.map_tax(taxes)
 
         fix_price = self.env['account.tax']._fix_tax_included_price