diff --git a/models/stock_location.py b/models/stock_location.py
index c8ab6a1..e80a907 100644
--- a/models/stock_location.py
+++ b/models/stock_location.py
@@ -68,6 +68,69 @@ class StockQuant(models.Model):
                     
         return allowed_location_ids
 
+    @api.model
+    def _get_gather_domain(self, product_id, location_id, lot_id=None, package_id=None, owner_id=None, strict=False):
+        """Override to apply location restrictions during reservation (gather)"""
+        result_domain = super()._get_gather_domain(product_id, location_id, lot_id, package_id, owner_id, strict)
+        
+        # FIX: If reserving from a non-internal location, DO NOT apply internal restrictions.
+        if location_id and location_id.usage != 'internal':
+            return result_domain
+            
+        allowed_location_ids = self._get_allowed_locations()
+        if allowed_location_ids:
+            # 1. Smart Domain Swap: find if there's already a location_id restriction (like child_of)
+            found_collision = False
+            new_domain = []
+            for leaf in result_domain:
+                if (isinstance(leaf, (list, tuple)) and 
+                    len(leaf) == 3 and 
+                    leaf[0] == 'location_id' and 
+                    leaf[1] in ('child_of', '=', 'in')):
+                    
+                    new_domain.append(('location_id', 'in', allowed_location_ids))
+                    found_collision = True
+                else:
+                    new_domain.append(leaf)
+            if found_collision:
+                result_domain = new_domain
+            else:
+                result_domain = Domain.AND([result_domain, [('location_id', 'in', allowed_location_ids)]])
+                
+        return result_domain
+
+    def _search(self, domain, offset=0, limit=None, order=None, *args, **kwargs):
+        """Override to apply location restrictions during search (e.g. catalog or list selection)"""
+        # CRITICAL FIX: If we are searching for specific IDs (e.g., Odoo is fetching selected records for save),
+        # we must NOT restrict the search results or we trigger 'Missing Product' validation errors 
+        # on backend fallback create logic.
+        search_by_id = any(isinstance(leaf, (list, tuple)) and leaf[0] == 'id' for leaf in domain)
+        if search_by_id:
+            return super()._search(domain, offset=offset, limit=limit, order=order, *args, **kwargs)
+
+        allowed_location_ids = self._get_allowed_locations()
+        if allowed_location_ids:
+            # 1. Smart Domain Swap: find if there's already a location_id restriction (like child_of)
+            found_collision = False
+            new_domain = []
+            for leaf in domain:
+                if (isinstance(leaf, (list, tuple)) and 
+                    len(leaf) == 3 and 
+                    leaf[0] == 'location_id' and 
+                    leaf[1] == 'child_of'):
+                    
+                    new_domain.append(('location_id', 'in', allowed_location_ids))
+                    found_collision = True
+                else:
+                    new_domain.append(leaf)
+            
+            if found_collision:
+                domain = new_domain
+            else:
+                domain = Domain.AND([domain, [('location_id', 'in', allowed_location_ids)]])
+                
+        return super()._search(domain, offset=offset, limit=limit, order=order, *args, **kwargs)
+
 
 class StockLocation(models.Model):
     _inherit = 'stock.location'