[IMP] point_of_sale: accounting lock dates and POS sessions

Forbid locking the fiscal year or period in case there is an open POS session into it. Without that, it will be impossible to close these sessions, as the lock date will not allow posting accounting entries for them.

Also forbid to create a session before lock date, as it would be impossible to close.

closes odoo/odoo#28257

Signed-off-by: Cedric Snauwaert (csn) <csn@openerp.com>

addons/point_of_sale/models/__init__.py

@@ -12,4 +12,5 @@ from . import pos_order
 from . import pos_session
 from . import product
 from . import res_partner
+from . import res_company
 from . import res_config_settings

addons/point_of_sale/models/pos_session.py

@@ -158,6 +158,14 @@ class PosSession(models.Model):
             ]) > 1:
             raise ValidationError(_("Another session is already opened for this point of sale."))
 
+    @api.constrains('start_at')
+    def _check_start_date(self):
+        for record in self:
+            company = record.config_id.journal_id.company_id
+            start_date = record.start_at.date()
+            if (company.period_lock_date and start_date <= company.period_lock_date) or (company.fiscalyear_lock_date and start_date <= company.fiscalyear_lock_date):
+                raise ValidationError(_("You cannot create a session before the accounting lock date."))
+
     @api.model
     def create(self, values):
         config_id = values.get('config_id') or self.env.context.get('default_config_id')

addons/point_of_sale/models/res_company.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+
+from odoo import api, models, fields, _
+from odoo.exceptions import ValidationError
+
+class ResCompany(models.Model):
+    _inherit = 'res.company'
+
+    @api.constrains('period_lock_date', 'fiscalyear_lock_date')
+    def validate_period_lock_date(self):
+        """ This constrains makes it impossible to change the period lock date if
+        some open POS session exists into it. Without that, these POS sessions
+        would trigger an error message saying that the period has been locked when
+        trying to close them.
+        """
+        pos_session_model = self.env['pos.session']
+        for record in self:
+            sessions_in_period = pos_session_model.search([('state', '!=', 'closed'), '|', ('start_at', '<=', record.period_lock_date), ('start_at', '<=', record.fiscalyear_lock_date)])
+            if sessions_in_period:
+                sessions_str = ', '.join(sessions_in_period.mapped('name'))
+                raise ValidationError(_("Please close all the point of sale sessions in this period before closing it. Open sessions are: %s ") % (sessions_str))