diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index 82ead2bdf0b..194407a7567 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -207,7 +207,6 @@ class PurchaseOrder(models.Model):
         self = self.with_company(self.company_id)
         if not self.partner_id:
             self.fiscal_position_id = False
-            self.payment_term_id = False
             self.currency_id = self.env.company.currency_id.id
         else:
             self.fiscal_position_id = self.env['account.fiscal.position'].get_fiscal_position(self.partner_id.id)
diff --git a/addons/sale/models/sale.py b/addons/sale/models/sale.py
index 9b1a7096d6a..0f537039544 100644
--- a/addons/sale/models/sale.py
+++ b/addons/sale/models/sale.py
@@ -342,7 +342,6 @@ class SaleOrder(models.Model):
             self.update({
                 'partner_invoice_id': False,
                 'partner_shipping_id': False,
-                'payment_term_id': False,
                 'fiscal_position_id': False,
             })
             return