diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index 3e36bf4518e..dac7ac1ece4 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -538,7 +538,7 @@ class PurchaseOrderLine(models.Model):
     @api.depends('product_id')
     def _compute_qty_received_method(self):
         for line in self:
-            if line.product_id.type in ['consu', 'service']:
+            if line.product_id and line.product_id.type in ['consu', 'service']:
                 line.qty_received_method = 'manual'
             else:
                 line.qty_received_method = False
@@ -697,7 +697,7 @@ class PurchaseOrderLine(models.Model):
     @api.depends('product_uom', 'product_qty', 'product_id.uom_id')
     def _compute_product_uom_qty(self):
         for line in self:
-            if line.product_id.uom_id != line.product_uom:
+            if line.product_id and line.product_id.uom_id != line.product_uom:
                 line.product_uom_qty = line.product_uom._compute_quantity(line.product_qty, line.product_id.uom_id)
             else:
                 line.product_uom_qty = line.product_qty
diff --git a/addons/purchase_stock/models/purchase.py b/addons/purchase_stock/models/purchase.py
index befdd46efea..d697538db9f 100644
--- a/addons/purchase_stock/models/purchase.py
+++ b/addons/purchase_stock/models/purchase.py
@@ -242,7 +242,7 @@ class PurchaseOrderLine(models.Model):
 
     def _compute_qty_received_method(self):
         super(PurchaseOrderLine, self)._compute_qty_received_method()
-        for line in self:
+        for line in self.filtered(lambda l: not l.display_type):
             if line.product_id.type in ['consu', 'product']:
                 line.qty_received_method = 'stock_moves'
 
@@ -275,7 +275,7 @@ class PurchaseOrderLine(models.Model):
         return line
 
     def write(self, values):
-        for line in self:
+        for line in self.filtered(lambda l: not l.display_type):
             if values.get('date_planned') and line.propagate_date:
                 new_date = fields.Datetime.to_datetime(values['date_planned'])
                 delta_days = (new_date - line.date_planned).total_seconds() / 86400
@@ -297,7 +297,7 @@ class PurchaseOrderLine(models.Model):
 
     def _create_or_update_picking(self):
         for line in self:
-            if line.product_id.type in ('product', 'consu'):
+            if line.product_id and line.product_id.type in ('product', 'consu'):
                 # Prevent decreasing below received quantity
                 if float_compare(line.product_qty, line.qty_received, line.product_uom.rounding) < 0:
                     raise UserError(_('You cannot decrease the ordered quantity below the received quantity.\n'
@@ -394,7 +394,7 @@ class PurchaseOrderLine(models.Model):
 
     def _create_stock_moves(self, picking):
         values = []
-        for line in self:
+        for line in self.filtered(lambda l: not l.display_type):
             for val in line._prepare_stock_moves(picking):
                 values.append(val)
         return self.env['stock.move'].create(values)
diff --git a/addons/purchase_stock/models/stock_rule.py b/addons/purchase_stock/models/stock_rule.py
index c23e5dee1b0..ea9d574195e 100644
--- a/addons/purchase_stock/models/stock_rule.py
+++ b/addons/purchase_stock/models/stock_rule.py
@@ -90,7 +90,7 @@ class StockRule(models.Model):
             procurements = self._merge_procurements(procurements_to_merge)
 
             po_lines_by_product = {}
-            grouped_po_lines = groupby(po.order_line.filtered(lambda l: l.product_uom == l.product_id.uom_po_id).sorted('product_id'), key=lambda l: l.product_id.id)
+            grouped_po_lines = groupby(po.order_line.filtered(lambda l: not l.display_type and l.product_uom == l.product_id.uom_po_id).sorted('product_id'), key=lambda l: l.product_id.id)
             for product, po_lines in grouped_po_lines:
                 po_lines_by_product[product] = self.env['purchase.order.line'].concat(*list(po_lines))
             po_line_values = []