You can now assign summary tasks to a work schedule. Thanks myoualid!

src/ifcopenshell-python/ifcopenshell/api/sequence/add_task.py

@@ -4,7 +4,14 @@ import ifcopenshell.api
 class Usecase:
     def __init__(self, file, **settings):
         self.file = file
-        self.settings = {"name": None, "predefined_type": "NOTDEFINED", "is_milestone":False, "identification": "none", "predecessor_to":None, "successor_from":None}
+        self.settings = {
+            "name": None,
+            "predefined_type": "NOTDEFINED",
+            "is_milestone": False,
+            "identification": "none",
+            "predecessor_to": None,
+            "successor_from": None,
+        }
         for key, value in settings.items():
             self.settings[key] = value
 
@@ -17,4 +24,4 @@ class Usecase:
             name=self.settings["name"],
         )
         task.IsMilestone = self.settings["is_milestone"]
-        return task
+        return task

src/ifcopenshell-python/ifcopenshell/api/sequence/data.py

@@ -52,6 +52,11 @@ class Data:
             data["StartTime"] = ifcopenshell.util.date.ifc2datetime(data["StartTime"])
             if data["FinishTime"]:
                 data["FinishTime"] = ifcopenshell.util.date.ifc2datetime(data["FinishTime"])
+            data["RelatedObjects"] = []
+            for rel in work_schedule.Controls:
+                for obj in rel.RelatedObjects:
+                    if obj.is_a("IfcTask"):
+                        data["RelatedObjects"].append(obj.id())
             cls.work_schedules[work_schedule.id()] = data
 
     @classmethod