diff --git a/stock_dynamic_routing/models/stock_location.py b/stock_dynamic_routing/models/stock_location.py
index 30177775f936..7d8a1244d3ac 100644
--- a/stock_dynamic_routing/models/stock_location.py
+++ b/stock_dynamic_routing/models/stock_location.py
@@ -14,3 +14,13 @@ def _location_parent_tree(self):
         # the recordset will be ordered bottom location to top location
         tree_ids.reverse()
         return self.browse(tree_ids)
+
+    def is_sublocation_of(self, others):
+        """Return True if self is a sublocation of at least one other
+
+        It is equivalent to the "child_of" operator, so it includes itself.
+        """
+        self.ensure_one()
+        # Efficient way to verify that the current location is
+        # below one of the other location without using SQL.
+        return any(self.parent_path.startswith(other.parent_path) for other in others)
diff --git a/stock_dynamic_routing/models/stock_move.py b/stock_dynamic_routing/models/stock_move.py
index a3785f007492..4aefb18c4354 100644
--- a/stock_dynamic_routing/models/stock_move.py
+++ b/stock_dynamic_routing/models/stock_move.py
@@ -252,10 +252,9 @@ def _apply_routing_rule_pull(self, routing_details):
                 __applying_routing_rule=True
             ).location_id = routing_rule.location_src_id
             move.picking_type_id = routing_rule.picking_type_id
-            location_path = move.location_dest_id.parent_path
-            rule_location_path = routing_rule.location_dest_id.parent_path
-            # if the move location is a parent of the rule's location
-            if rule_location_path.startswith(location_path):
+            dest_location = move.location_dest_id
+            rule_location = routing_rule.location_dest_id
+            if rule_location.is_sublocation_of(dest_location):
                 # The destination of the move, as a parent of the destination
                 # of the routing, goes to the correct place, but is not precise
                 # enough: set the new destination to match the rule's one.
@@ -263,8 +262,7 @@ def _apply_routing_rule_pull(self, routing_details):
                 # which may reapply a new routing rule on the dest. move.
                 move._routing_pull_switch_destination(routing_rule)
 
-            # if the move location is not a child of the rule's location
-            elif not location_path.startswith(rule_location_path):
+            elif not dest_location.is_sublocation_of(rule_location):
                 # The destination of the move is unrelated (nor identical, nor
                 # a parent or a child) to the routing destination: in this case
                 # we have to add a routing move before the current move to
@@ -352,11 +350,10 @@ def _apply_routing_rule_push(self, routing_details):
                 # routing move after this one
                 continue
 
-            rule_location_path = routing_rule.location_src_id.parent_path
-            location_path = move.location_id.parent_path
-            # if rule location is parent of location
-            if location_path.startswith(rule_location_path):
-                # The source is already correct (more precise than the routing),
+            rule_location = routing_rule.location_src_id
+            location = move.location_id
+            if location.is_sublocation_of(rule_location):
+                # The source is already correct (or more precise than the routing),
                 # but we still want to classify the move in the routing's picking
                 # type.
                 # If the source location of the move is a child of the routing's
diff --git a/stock_dynamic_routing/models/stock_routing_rule.py b/stock_dynamic_routing/models/stock_routing_rule.py
index 56f3876a3574..2b7b91bd0009 100644
--- a/stock_dynamic_routing/models/stock_routing_rule.py
+++ b/stock_dynamic_routing/models/stock_routing_rule.py
@@ -61,9 +61,7 @@ def _constrains_picking_type_location(self):
 
             if record.method == "pull" and (
                 not record.location_src_id
-                or not record.location_src_id.parent_path.startswith(
-                    base_location.parent_path
-                )
+                or not record.location_src_id.is_sublocation_of(base_location)
             ):
                 raise exceptions.ValidationError(
                     _(
@@ -73,9 +71,7 @@ def _constrains_picking_type_location(self):
                 )
             elif record.method == "push" and (
                 not record.location_dest_id
-                or not record.location_dest_id.parent_path.startswith(
-                    base_location.parent_path
-                )
+                or not record.location_dest_id.is_sublocation_of(base_location)
             ):
 
                 raise exceptions.ValidationError(