diff --git a/addons/crm/wizard/crm_lead_to_opportunity.py b/addons/crm/wizard/crm_lead_to_opportunity.py
index e2fb70bfa56..21a553a59ff 100644
--- a/addons/crm/wizard/crm_lead_to_opportunity.py
+++ b/addons/crm/wizard/crm_lead_to_opportunity.py
@@ -257,7 +257,7 @@ class crm_lead2opportunity_mass_convert(osv.osv_memory):
         if data.name == 'convert' and data.deduplicate:
             merged_lead_ids = []
             remaining_lead_ids = []
-            for lead in data.opportunity_ids:
+            for lead in self.pool['crm.lead'].browse(cr, uid, context.get('active_ids', []), context=context):
                 duplicated_lead_ids = self._get_duplicated_leads(cr, uid, lead.partner_id.id, lead.partner_id and lead.partner_id.email or lead.email_from)
                 if len(duplicated_lead_ids) > 1:
                     lead_id = self.pool.get('crm.lead').merge_opportunity(cr, uid, duplicated_lead_ids, False, False, context=context)
diff --git a/addons/crm/wizard/crm_lead_to_opportunity_view.xml b/addons/crm/wizard/crm_lead_to_opportunity_view.xml
index 130aa4192d6..58fbe244ba4 100644
--- a/addons/crm/wizard/crm_lead_to_opportunity_view.xml
+++ b/addons/crm/wizard/crm_lead_to_opportunity_view.xml
@@ -59,9 +59,9 @@
                         <field name="section_id" groups="base.group_multi_salesteams"/>
                         <field name="user_ids" widget="many2many_tags"/>
                     </group>
-                    <label for="opportunity_ids" string="Leads with existing duplicates (for information)" help="Leads that you selected that have duplicates. If the list is empty, it means that no duplicates were found"/>
+                    <label for="opportunity_ids" string="Leads with existing duplicates (for information)" help="Leads that you selected that have duplicates. If the list is empty, it means that no duplicates were found" attrs="{'invisible': [('deduplicate', '=', False)]}"/>
                     <group attrs="{'invisible': [('deduplicate', '=', False)]}">
-                        <field name="opportunity_ids" colspan="4" nolabel="1">
+                        <field name="opportunity_ids" colspan="4" nolabel="1" readonly="1">
                             <tree create="false" delete="false">
                                 <field name="create_date"/>
                                 <field name="name"/>