[FIX] point_of_sale: Show warning when pricelist company missmatches

This commit ensure the pricelists are properly configured before launching a pos session.

Steps to reproduce:
- Have a V13 with point_of_sale
- Have minimum 2 companies A & B
- Select both companies in the company selector
- Go to Settings / General Settings
  - Point of Sale
    - Check Pricelists
- Go to Point of Sale
  - Open a pos.config PC
    - Set a Pricelist PL as Default Pricelist
- Go to Point of Sale / Products / Pricelists
  - Open PL
    - Set a company (must be different than PC)
- Go to Point of Sale
  - Click "New session" on PC
--> Traceback

In V13, the traceback shows as "Traceback not available"
As from V14, the traceback is shown properly

A variant would be to start the session before changing
the pricelist company then click on "Resume" on PC

closes odoo/odoo#78724

X-original-commit: 6099c366
Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

addons/point_of_sale/models/pos_config.py

@@ -390,6 +390,14 @@ class PosConfig(models.Model):
                 _("You must have at least one payment method configured to launch a session.")
             )
 
+    @api.constrains('pricelist_id', 'available_pricelist_ids')
+    def _check_pricelists(self):
+        self._check_companies()
+        self = self.sudo()
+        if self.pricelist_id.company_id and self.pricelist_id.company_id != self.company_id:
+            raise ValidationError(
+                _("The default pricelist must belong to no company or the company of the point of sale."))
+
     @api.constrains('company_id', 'available_pricelist_ids')
     def _check_companies(self):
         if any(self.available_pricelist_ids.mapped(lambda pl: pl.company_id.id not in (False, self.company_id.id))):
@@ -608,6 +616,7 @@ class PosConfig(models.Model):
         """
         self.ensure_one()
         if not self.current_session_id:
+            self._check_pricelists()
             self._check_company_journal()
             self._check_company_invoice_journal()
             self._check_company_payment()
@@ -630,6 +639,7 @@ class PosConfig(models.Model):
         return self._open_session(self.current_session_id.id)
 
     def _open_session(self, session_id):
+        self._check_pricelists()  # The pricelist company might have changed after the first opening of the session
         return {
             'name': _('Session'),
             'view_mode': 'form,tree',