diff --git a/addons/purchase/models/account_invoice.py b/addons/purchase/models/account_invoice.py
index 2b614f7cd6e..1391e5f0409 100644
--- a/addons/purchase/models/account_invoice.py
+++ b/addons/purchase/models/account_invoice.py
@@ -37,7 +37,7 @@ class AccountMove(models.Model):
             return
 
         # Copy data from PO
-        invoice_vals = self.purchase_id._prepare_invoice()
+        invoice_vals = self.purchase_id.with_company(self.purchase_id.company_id)._prepare_invoice()
         self.update(invoice_vals)
 
         # Copy purchase lines.
diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index f6d5b97fbbf..bbc37b9c546 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -461,6 +461,7 @@ class PurchaseOrder(models.Model):
             if order.invoice_status != 'to invoice':
                 continue
 
+            order = order.with_company(order.company_id)
             pending_section = None
             # Invoice values.
             invoice_vals = order._prepare_invoice()
@@ -519,7 +520,6 @@ class PurchaseOrder(models.Model):
         """Prepare the dict of values to create the new invoice for a purchase order.
         """
         self.ensure_one()
-        self = self.with_company(self.company_id)
         move_type = self._context.get('default_move_type', 'in_invoice')
         journal = self.env['account.move'].with_context(default_move_type=move_type)._get_default_journal()
         if not journal:
diff --git a/addons/sale/models/sale.py b/addons/sale/models/sale.py
index 2815aa92761..8c90b4d5047 100644
--- a/addons/sale/models/sale.py
+++ b/addons/sale/models/sale.py
@@ -533,8 +533,7 @@ class SaleOrder(models.Model):
         a clean extension chain).
         """
         self.ensure_one()
-        self = self.with_company(self.company_id)
-        journal = self.env['account.move'].with_company(self.company_id).with_context(default_move_type='out_invoice')._get_default_journal()
+        journal = self.env['account.move'].with_context(default_move_type='out_invoice')._get_default_journal()
         if not journal:
             raise UserError(_('Please define an accounting sales journal for the company %s (%s).') % (self.company_id.name, self.company_id.id))
 
@@ -631,8 +630,9 @@ Reason(s) of this behavior could be:
         invoice_vals_list = []
         invoice_item_sequence = 0
         for order in self:
+            order = order.with_company(order.company_id)
             current_section_vals = None
-            down_payments = self.env['sale.order.line']
+            down_payments = order.env['sale.order.line']
 
             # Invoice values.
             invoice_vals = order._prepare_invoice()
@@ -660,7 +660,7 @@ Reason(s) of this behavior could be:
             # If down payments are present in SO, group them under common section
             if down_payments:
                 invoice_item_sequence += 1
-                down_payments_section = self._prepare_down_payment_section_line(sequence=invoice_item_sequence)
+                down_payments_section = order._prepare_down_payment_section_line(sequence=invoice_item_sequence)
                 invoice_lines_vals.append(down_payments_section)
                 for down_payment in down_payments:
                     invoice_item_sequence += 1
diff --git a/addons/sale_purchase/models/sale_order.py b/addons/sale_purchase/models/sale_order.py
index 84f5dc89124..a9d6ae19abf 100644
--- a/addons/sale_purchase/models/sale_order.py
+++ b/addons/sale_purchase/models/sale_order.py
@@ -192,7 +192,6 @@ class SaleOrderLine(models.Model):
             :rtype: dict
         """
         self.ensure_one()
-        self = self.with_company(self.company_id)
         partner_supplier = supplierinfo.name
         fpos = self.env['account.fiscal.position'].sudo().get_fiscal_position(partner_supplier.id)
         date_order = self._purchase_get_date_order(supplierinfo)