diff --git a/addons/l10n_be_intrastat/l10n_be_intrastat.py b/addons/l10n_be_intrastat/l10n_be_intrastat.py
index 57ebb637d4d..b4974e799ec 100644
--- a/addons/l10n_be_intrastat/l10n_be_intrastat.py
+++ b/addons/l10n_be_intrastat/l10n_be_intrastat.py
@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from openerp import fields, models
+from openerp import fields, models, api
 
 
 class account_invoice_line(models.Model):
@@ -65,6 +65,7 @@ class product_category(models.Model):
 
     intrastat_id = fields.Many2one('report.intrastat.code', 'Intrastat Code')
 
+    @api.multi
     def get_intrastat_recursively(self):
         """ Recursively search in categories to find an intrastat code id
         """
@@ -81,6 +82,7 @@ class product_product(models.Model):
     _name = "product.product"
     _inherit = "product.product"
 
+    @api.multi
     def get_intrastat_recursively(self):
         """ Recursively search in categories to find an intrastat code id
         """
diff --git a/addons/l10n_be_intrastat/wizard/xml_decl.py b/addons/l10n_be_intrastat/wizard/xml_decl.py
index c59103230f5..7779378bb1a 100644
--- a/addons/l10n_be_intrastat/wizard/xml_decl.py
+++ b/addons/l10n_be_intrastat/wizard/xml_decl.py
@@ -303,10 +303,9 @@ class xml_decl(osv.TransientModel):
                 amount = inv_line.price_unit * inv_line.quantity
             else:
                 amount = 0
-            weight = (inv_line.product_id.weight_net or 0.0) * \
+            weight = (inv_line.product_id.weight or 0.0) * \
                 self.pool.get('product.uom')._compute_qty(cr, uid, inv_line.uom_id.id, inv_line.quantity, inv_line.product_id.uom_id.id)
-            if (not inv_line.uos_id.category_id or not inv_line.product_id.uom_id.category_id
-                    or inv_line.uos_id.category_id.id != inv_line.product_id.uom_id.category_id.id):
+            if not inv_line.product_id.uom_id.category_id:
                 supply_units = inv_line.quantity
             else:
                 supply_units = inv_line.quantity * inv_line.uom_id.factor