From b206e9009732a0395637ea8a01fa9e51c140beaa Mon Sep 17 00:00:00 2001
From: Sigma Dimensions <79010126+myoualid@users.noreply.github.com>
Date: Sun, 18 Dec 2022 04:17:17 +0100
Subject: [PATCH] Proposal to use parent productivity to calculate resource
 work.

---
 .../api/resource/calculate_resource_work.py          | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/ifcopenshell-python/ifcopenshell/api/resource/calculate_resource_work.py b/src/ifcopenshell-python/ifcopenshell/api/resource/calculate_resource_work.py
index e1dd626d41..a9f2c5e06c 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/resource/calculate_resource_work.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/resource/calculate_resource_work.py
@@ -63,7 +63,17 @@ class Usecase:
             self.settings["resource"]
         ).get("EPset_Productivity", None)
         if not self.productivity:
-            return
+            # Proposal for Schema - If instance doesn't have any productivity, use the parent's productivity - if any.
+            if not self.settings["resource"].Nests:
+                return
+            else:
+                parent_resource = self.settings["resource"].Nests[0].RelatingObject
+                self.productivity = ifcopenshell.util.element.get_psets(
+                    parent_resource
+                ).get("EPset_Productivity", None)
+                if not self.productivity:
+                    return
+
         unit_consumed = self.get_unit_consumed()
         self.unit_produced_name = self.productivity.get(
             "BaseQuantityProducedName", None