fix removing cost item value

src/ifcopenshell-python/ifcopenshell/api/cost/assign_cost_value.py

@@ -67,7 +67,7 @@ class Usecase:
         if self.settings["cost_item"].CostValues:
             [
                 ifcopenshell.api.run(
-                    "cost.remove_cost_item_value",
+                    "cost.remove_cost_value",
                     self.file,
                     parent=self.settings["cost_item"],
                     cost_value=cost_value,

src/ifcopenshell-python/ifcopenshell/api/cost/copy_cost_item_values.py

@@ -17,6 +17,7 @@
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
 import ifcopenshell.util.element
+import ifcopenshell.api
 
 
 class Usecase: