diff --git a/account_financial_report_webkit/report/common_partner_reports.py b/account_financial_report_webkit/report/common_partner_reports.py
index a6c2d8d8..13b6ce18 100644
--- a/account_financial_report_webkit/report/common_partner_reports.py
+++ b/account_financial_report_webkit/report/common_partner_reports.py
@@ -78,8 +78,9 @@ class CommonPartnersReportHeaderWebkit(CommonReportHeaderWebkit):
 
         return sql_conditions, search_params
 
-    def _get_partners_move_line_ids(self, filter_from, account_id, start, stop, target_move, opening_mode='include_opening',
-                   exclude_reconcile=False, partner_filter=False):
+    def _get_partners_move_line_ids(self, filter_from, account_id, start, stop,
+                                    target_move, opening_mode='exclude_opening',
+                                    exclude_reconcile=False, partner_filter=False):
 
         final_res = defaultdict(list)
 
diff --git a/account_financial_report_webkit/report/partner_balance.py b/account_financial_report_webkit/report/partner_balance.py
index 1e717832..ae560dd7 100644
--- a/account_financial_report_webkit/report/partner_balance.py
+++ b/account_financial_report_webkit/report/partner_balance.py
@@ -65,6 +65,16 @@ class PartnerBalanceWebkit(report_sxw.rml_parse, CommonPartnerBalanceReportHeade
             ],
         })
 
+    def _get_initial_balance_mode(self, start_period):
+        """ Force computing of initial balance for the partner balance,
+        because we cannot use the entries generated by
+        OpenERP in the opening period.
+
+        OpenERP allows to reconcile move lines between different partners,
+        so the generated entries in the opening period are wrong.
+        """
+        return 'initial_balance'
+
     def set_context(self, objects, data, ids, report_type=None):
         """Populate a ledger_lines attribute on each browse record that will be used
         by mako template"""
diff --git a/account_financial_report_webkit/report/partners_ledger.py b/account_financial_report_webkit/report/partners_ledger.py
index 44b01699..39ba6ca5 100644
--- a/account_financial_report_webkit/report/partners_ledger.py
+++ b/account_financial_report_webkit/report/partners_ledger.py
@@ -66,6 +66,16 @@ class PartnersLedgerWebkit(report_sxw.rml_parse, CommonPartnersReportHeaderWebki
             ],
         })
 
+    def _get_initial_balance_mode(self, start_period):
+        """ Force computing of initial balance for the partner ledger,
+        because we cannot use the entries generated by
+        OpenERP in the opening period.
+
+        OpenERP allows to reconcile move lines between different partners,
+        so the generated entries in the opening period are wrong.
+        """
+        return 'initial_balance'
+
     def set_context(self, objects, data, ids, report_type=None):
         """Populate a ledger_lines attribute on each browse record that will be used
         by mako template"""