From 703f0a6b70c1f3084a683066a9635cfe44a0660e Mon Sep 17 00:00:00 2001
From: "Sigma Dimensions (Yass)" <79010126+myoualid@users.noreply.github.com>
Date: Sat, 12 Aug 2023 14:57:01 +0100
Subject: [PATCH] fix orphaned data when unassigning element quantities from
 cost item control

---
 .../ifcopenshell/api/cost/unassign_cost_item_quantity.py     | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ifcopenshell-python/ifcopenshell/api/cost/unassign_cost_item_quantity.py b/src/ifcopenshell-python/ifcopenshell/api/cost/unassign_cost_item_quantity.py
index e4b48bafa0..967cec4162 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/cost/unassign_cost_item_quantity.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/cost/unassign_cost_item_quantity.py
@@ -98,4 +98,7 @@ class Usecase:
                 count = 0
                 for rel in self.settings["cost_item"].Controls:
                     count += len(rel.RelatedObjects)
-                quantity[3] = count
+                if count:
+                    quantity[3] = count
+                else:
+                    self.file.remove(quantity)