diff --git a/addons/account/account.py b/addons/account/account.py
index 01cc9575357..1817d50901e 100644
--- a/addons/account/account.py
+++ b/addons/account/account.py
@@ -1163,8 +1163,20 @@ class account_move(osv.osv):
     # TODO: Check if period is closed !
     #
     def create(self, cr, uid, vals, context={}):
-        if 'line_id' in vals:
-            if 'journal_id' in vals:
+        if 'line_id' in vals and context.get('copy'):
+            for l in vals['line_id']:
+                if not l[0]:
+                    l[2].update({
+                        'reconcile_id':False,
+                        'reconcil_partial_id':False,
+                        'analytic_lines':False,
+                        'invoice':False,
+                        'ref':False,
+                        'balance':False,
+                        'account_tax_id':False,
+                    })
+            
+            if 'journal_id' in vals and vals.get('journal_id', False):
                 for l in vals['line_id']:
                     if not l[0]:
                         l[2]['journal_id'] = vals['journal_id']
@@ -1190,11 +1202,14 @@ class account_move(osv.osv):
             result = super(account_move, self).create(cr, uid, vals, context)
         return result
 
-    def copy(self, cr, uid, id, default=None, context=None):
-        if default is None:
-            default = {}
-        default = default.copy()
-        default.update({'state':'draft', 'name':'/',})
+    def copy(self, cr, uid, id, default={}, context={}):
+        default.update({
+            'state':'draft',
+            'name':'/',
+        })
+        context.update({
+            'copy':True
+        })
         return super(account_move, self).copy(cr, uid, id, default, context)
 
     def unlink(self, cr, uid, ids, context={}, check=True):
diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index 76989d2f02c..d60d01bd824 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -20,7 +20,6 @@
 ##############################################################################
 import time
 from datetime import datetime
-
 import netsvc
 from osv import fields, osv
 from tools.translate import _
@@ -454,6 +453,7 @@ class account_move_line(osv.osv):
                         context=context)
                 dt = period.date_start
         return dt
+        
     def _get_currency(self, cr, uid, context={}):
         if not context.get('journal_id', False):
             return False
@@ -1110,10 +1110,10 @@ class account_move_line(osv.osv):
 
         #if not 'currency_id' in vals:
         #    vals['currency_id'] = account.company_id.currency_id.id
-
+        
         result = super(osv.osv, self).create(cr, uid, vals, context)
         # CREATE Taxes
-        if vals.get('account_tax_id',False):
+        if vals.get('account_tax_id', False):
             tax_id = tax_obj.browse(cr, uid, vals['account_tax_id'])
             total = vals['debit'] - vals['credit']
             if journal.refund_journal:
@@ -1186,7 +1186,7 @@ class account_move_line(osv.osv):
         if check and ((not context.get('no_store_function')) or journal.entry_posted):
             tmp = self.pool.get('account.move').validate(cr, uid, [vals['move_id']], context)
             if journal.entry_posted and tmp:
-                self.pool.get('account.move').button_validate(cr,uid, [vals['move_id']],context)
+                rs = self.pool.get('account.move').button_validate(cr,uid, [vals['move_id']],context)
         return result
 account_move_line()
 
diff --git a/addons/account/account_view.xml b/addons/account/account_view.xml
index c6f1e04666f..573fa104b7b 100644
--- a/addons/account/account_view.xml
+++ b/addons/account/account_view.xml
@@ -1105,7 +1105,7 @@
                     <field name="partner_id"/>
                     <field name="line_id"/>
                     <field name="to_check" groups="base.group_extended"/>
-                    <field name="amount"/>
+                    <field name="amount" operator="+"/>
                     <field name="state"/>
                     <button name="button_validate" states="draft" string="Approve" type="object" icon="terp-camera_test"/>
                 </tree>
@@ -1125,7 +1125,6 @@
                         <field name="period_id"/>
                         <field name="date" select="1"/>
                         <field name="company_id" required="1" groups="base.group_multi_company"/>
-                        
                         <field name="partner_id" invisible="1" select="1"/>
                         <field name="amount" invisible="1" select="1"/>
                     </group>