[ADD] inheritence of ir.config_parameter

pms/models/__init__.py

@@ -4,6 +4,7 @@
 
 from . import ir_http
 from . import ir_sequence
+from . import ir_config_parameter
 
 # from . import payment_return
 from . import pms_board_service_room_type

pms/models/ir_config_parameter.py

@@ -0,0 +1,22 @@
+from odoo import _, api, models
+from odoo.exceptions import ValidationError
+
+
+class IrConfigParameter(models.Model):
+    _inherit = "ir.config_parameter"
+
+    def unlink(self):
+        for record in self:
+            if (
+                record.key == "product.product_pricelist_setting"
+                and record.value == "advanced"
+            ):
+                raise ValidationError(_("Cannot delete this parameter"))
+        return super().unlink()
+
+    @api.constrains("key", "value")
+    def check_value(self):
+        if self.key == "product.product_pricelist_setting" and self.value != "advanced":
+            raise ValidationError(
+                _("The parameter Advanced price rules cannot be modified")
+            )