diff --git a/addons/account_voucher/account_voucher.py b/addons/account_voucher/account_voucher.py
index ccb4f952310..5f48a8020c4 100644
--- a/addons/account_voucher/account_voucher.py
+++ b/addons/account_voucher/account_voucher.py
@@ -547,6 +547,20 @@ class account_voucher(osv.osv):
         vals = self.recompute_payment_rate(cr, uid, ids, res, currency_id, date, ttype, journal_id, amount, context=context)
         for key in vals.keys():
             res[key].update(vals[key])
+        #TODO: onchange_partner_id() should not returns [pre_line, line_dr_ids, payment_rate...] for type sale, and not 
+        # [pre_line, line_cr_ids, payment_rate...] for type purchase.
+        # We should definitively split account.voucher object in two and make distinct on_change functions. In the 
+        # meanwhile, bellow lines must be there because the fields aren't present in the view, what crashes if the 
+        # onchange returns a value for them
+        print "TTYPE", ttype
+        if ttype == 'sale':
+            del(res['value']['line_dr_ids'])
+            del(res['value']['pre_line'])
+            del(res['value']['payment_rate'])
+        elif ttype == 'purchase':
+            del(res['value']['line_cr_ids'])
+            del(res['value']['pre_line'])
+            del(res['value']['payment_rate'])
         return res
 
     def recompute_voucher_lines(self, cr, uid, ids, partner_id, journal_id, price, currency_id, ttype, date, context=None):
@@ -588,7 +602,7 @@ class account_voucher(osv.osv):
 
         #set default values
         default = {
-            'value': {'line_ids': [] ,'line_dr_ids': [] ,'line_cr_ids': [] ,'pre_line': False,},
+            'value': {'line_dr_ids': [] ,'line_cr_ids': [] ,'pre_line': False,},
         }
 
         #drop existing lines
@@ -772,8 +786,10 @@ class account_voucher(osv.osv):
         if account_id and account_id.tax_ids:
             tax_id = account_id.tax_ids[0].id
 
-        vals = self.onchange_price(cr, uid, ids, line_ids, tax_id, partner_id, context)
-        vals['value'].update({'tax_id':tax_id,'amount': amount})
+        vals = {'value':{} }
+        if ttype in ('sale', 'purchase'):
+            vals = self.onchange_price(cr, uid, ids, line_ids, tax_id, partner_id, context)
+            vals['value'].update({'tax_id':tax_id,'amount': amount})
         currency_id = False
         if journal.currency:
             currency_id = journal.currency.id
diff --git a/addons/account_voucher/account_voucher_view.xml b/addons/account_voucher/account_voucher_view.xml
index 5e26c366778..f8bab444453 100644
--- a/addons/account_voucher/account_voucher_view.xml
+++ b/addons/account_voucher/account_voucher_view.xml
@@ -34,6 +34,7 @@
             </field>
         </record>
 
+        <!-- where and when is this view used?? -->
         <record model="ir.ui.view" id="view_voucher_form">
             <field name="name">account.voucher.form</field>
             <field name="model">account.voucher</field>
diff --git a/addons/account_voucher/test/account_voucher_report.yml b/addons/account_voucher/test/account_voucher_report.yml
index a87e4f0fc2a..60dc4103553 100644
--- a/addons/account_voucher/test/account_voucher_report.yml
+++ b/addons/account_voucher/test/account_voucher_report.yml
@@ -2,6 +2,7 @@
   Demo for Account Voucher
 -
   !record {model: account.voucher, id: account_voucher_voucheraxelor0again, view: view_sale_receipt_form}:
+    type: sale
     account_id: account.cash
     company_id: base.main_company
     journal_id: account.bank_journal
diff --git a/addons/account_voucher/voucher_sales_purchase_view.xml b/addons/account_voucher/voucher_sales_purchase_view.xml
index 38b0bbefd18..4c388730644 100644
--- a/addons/account_voucher/voucher_sales_purchase_view.xml
+++ b/addons/account_voucher/voucher_sales_purchase_view.xml
@@ -72,6 +72,7 @@
                     <h1><label for="number" string="Sale Receipt"/> <field name="number" class="oe_inline" readonly="1"/></h1>
                     <group>
                         <group>
+                            <field name="type" invisible="True"/>
                             <field name="partner_id" domain="[('customer','=',True)]" on_change="onchange_partner_id(partner_id, journal_id, amount, currency_id, type, date, context)" string="Customer" context="{'search_default_customer':1, 'show_address': 1}" options='{"always_reload": true}'/>
                             <field name="company_id" widget="selection" groups="base.group_multi_company"/>
                         </group>
@@ -83,7 +84,6 @@
                             <field name="paid_amount_in_company_currency" invisible="1"/>
                             <field name="currency_id" invisible="1"/>
                         </group>
-                        <field name="type" invisible="True"/>
                     </group>
                     <notebook>
                         <page string="Sales Information">
@@ -95,12 +95,6 @@
                                     <field name="account_analytic_id" groups="analytic.group_analytic_accounting"/>
                                 </tree>
                             </field>
-                            <!-- TODO: onchange_partner_id() should not returns [line_ids, pre_line, line_dr_ids...] for type sale, and not [line_ids, pre_line, line_cr_ids,...] for type purchase -->
-                            <!-- in the meanwhile, bellow lines must be there because the fields must be present in the view if the onchange returns a value for them-->
-                            <field name="pre_line" invisible="1"/>
-                            <field name="line_ids" invisible="1"/>
-                            <field name="payment_rate" invisible="1"/>
-                            <field name="line_dr_ids" invisible="1"/>
 			                <group>
                                 <field name="narration" placeholder="Internal Notes" nolabel="1"/>
                                 <group class="oe_subtotal_footer oe_right">
@@ -255,12 +249,6 @@
                                     <field name="account_analytic_id" groups="analytic.group_analytic_accounting"/>
                                 </tree>
                             </field>
-                            <!-- TODO: onchange_partner_id() should not returns [line_ids, pre_line, line_dr_ids...] for type sale, and not [line_ids, pre_line, line_cr_ids,...] for type purchase -->
-                            <!-- in the meanwhile, bellow lines must be there because the fields must be present in the view if the onchange returns a value for them-->
-                            <field name="pre_line" invisible="1"/>
-                            <field name="line_ids" invisible="1"/>
-                            <field name="payment_rate" invisible="1"/>
-                            <field name="line_cr_ids" invisible="1"/>
                             <group>
                                 <field name="narration" placeholder="Internal Notes" nolabel="1"/>
                                 <group class="oe_subtotal_footer oe_right">