diff --git a/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py b/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py
index 34e20aa63a..86881265af 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py
@@ -16,9 +16,9 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
+import ifcopenshell.api.control
 import ifcopenshell.api.root
 import ifcopenshell.api.nest
-import ifcopenshell.api.owner
 import ifcopenshell.guid
 from typing import Optional
 
@@ -59,15 +59,7 @@ def add_cost_item(
     cost_item_ = ifcopenshell.api.root.create_entity(file, ifc_class="IfcCostItem")
 
     if cost_schedule:
-        file.create_entity(
-            "IfcRelAssignsToControl",
-            **{
-                "GlobalId": ifcopenshell.guid.new(),
-                "OwnerHistory": ifcopenshell.api.owner.create_owner_history(file),
-                "RelatedObjects": [cost_item_],
-                "RelatingControl": cost_schedule,
-            },
-        )
+        ifcopenshell.api.control.assign_control(file, cost_schedule, cost_item_)
     elif cost_item:
         ifcopenshell.api.nest.assign_object(file, related_objects=[cost_item_], relating_object=cost_item)
     return cost_item_
diff --git a/src/ifcopenshell-python/ifcopenshell/api/sequence/add_task.py b/src/ifcopenshell-python/ifcopenshell/api/sequence/add_task.py
index f6fa8feb8e..03cf6cb5eb 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/sequence/add_task.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/sequence/add_task.py
@@ -16,9 +16,9 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
+import ifcopenshell.api.control
 import ifcopenshell.api.root
 import ifcopenshell.api.nest
-import ifcopenshell.api.owner
 import ifcopenshell
 import ifcopenshell.guid
 from typing import Optional
@@ -139,15 +139,7 @@ def add_task(
         task.Identification = identification
     task.IsMilestone = False
     if work_schedule:
-        file.create_entity(
-            "IfcRelAssignsToControl",
-            **{
-                "GlobalId": ifcopenshell.guid.new(),
-                "OwnerHistory": ifcopenshell.api.owner.create_owner_history(file),
-                "RelatedObjects": [task],
-                "RelatingControl": work_schedule,
-            }
-        )
+        ifcopenshell.api.control.assign_control(file, work_schedule, task)
     elif parent_task:
         rel = ifcopenshell.api.nest.assign_object(
             file,