diff --git a/addons/inter_company_rules/models/purchase_order.py b/addons/inter_company_rules/models/purchase_order.py
index 24151ec4117..2665a8e69c4 100644
--- a/addons/inter_company_rules/models/purchase_order.py
+++ b/addons/inter_company_rules/models/purchase_order.py
@@ -51,8 +51,9 @@ class purchase_order(models.Model):
         # read it as sudo, because inter-compagny user can not have the access right on PO
         sale_order_data = self.sudo()._prepare_sale_order_data(self.name, company_partner, company, self.dest_address_id and self.dest_address_id.id or False)
         sale_order = SaleOrder.sudo(intercompany_uid).create(sale_order_data[0])
-        for line in self.order_line:
-            so_line_vals = self.sudo()._prepare_sale_order_line_data(line, company, sale_order.id)
+        # lines are browse as sudo to access all data required to be copied on SO line (mainly for company dependent field like taxes)
+        for line in self.order_line.sudo():
+            so_line_vals = self._prepare_sale_order_line_data(line, company, sale_order.id)
             SaleOrderLine.sudo(intercompany_uid).create(so_line_vals)
 
         # write supplier reference field on PO
diff --git a/addons/inter_company_rules/models/sale_order.py b/addons/inter_company_rules/models/sale_order.py
index 685cd70861a..a52bb404e53 100644
--- a/addons/inter_company_rules/models/sale_order.py
+++ b/addons/inter_company_rules/models/sale_order.py
@@ -54,8 +54,8 @@ class sale_order(models.Model):
         # read it as sudo, because inter-compagny user can not have the access right on PO
         po_vals = self.sudo()._prepare_purchase_order_data(company, company_partner)
         purchase_order = PurchaseOrder.sudo(intercompany_uid).create(po_vals[0])
-        for line in self.order_line:
-            po_line_vals = self.sudo()._prepare_purchase_order_line_data(line, self.date_order, purchase_order.id, company)
+        for line in self.order_line.sudo():
+            po_line_vals = self._prepare_purchase_order_line_data(line, self.date_order, purchase_order.id, company)
             PurchaseOrderLine.sudo(intercompany_uid).create(po_line_vals)
 
         # write customer reference field on SO