[FIX] purchase: avoid updating data_planned on section/note

Do not update the date_planned of section/note purchase lines when the
date is changed on the order.

Based on f3ebab6eb52e3dc8be1f030aecfff348a22f7e09

opw-2429853

closes odoo/odoo#64458

X-original-commit: c1d5a077f26d5cb5f42888f21dafd78e3432853f
Signed-off-by: Jorge Pinna Puissant (jpp) <jpp@odoo.com>

addons/purchase/models/purchase.py

@@ -196,7 +196,7 @@ class PurchaseOrder(models.Model):
     @api.onchange('date_planned')
     def onchange_date_planned(self):
         if self.date_planned:
-            self.order_line.date_planned = self.date_planned
+            self.order_line.filtered(lambda line: not line.display_type).date_planned = self.date_planned
 
     @api.model
     def create(self, vals):