feat: Add safety refresh to recalculate current value, quantity, and extra cost during inventory revaluation validation to handle race conditions.

models/stock_inventory_revaluation.py

@@ -99,6 +99,24 @@ class StockInventoryRevaluation(models.Model):
     def action_validate(self):
         self.ensure_one()
         
+        # 0. Safety Refresh: Re-calculate current value/quantity from DB to handle race conditions
+        # Identify layers created UP TO the revaluation date
+        layers = self.env['stock.valuation.layer'].search([
+            ('product_id', '=', self.product_id.id),
+            ('create_date', '<=', self.date),
+            ('company_id', '=', self.company_id.id)
+        ])
+        real_qty = sum(layers.mapped('quantity'))
+        real_value = sum(layers.mapped('value'))
+        
+        # Update if stale
+        # We assume 'new_value' is the User's Truth (Target).
+        if self.normalization_adjustment: 
+             self.current_value = real_value
+             self.quantity = real_qty
+             # Recalculate Extra Cost to ensure: Real + Extra = Target
+             self.extra_cost = self.new_value - self.current_value
+        
         # If normalizing, we actually expect/allow Extra Cost to be anything, 
         # as long as New Value (Current + Extra) is valid.
         # But legacy check says extra_cost != 0.