Apply aggregate constraints instead of removing.

src/bonsai/bonsai/bim/module/aggregate/operator.py

@@ -96,7 +96,7 @@ class BIM_OT_aggregate_unassign_object(bpy.types.Operator, tool.Ifc.Operator):
                 related_obj=tool.Ifc.get_object(element),
             )
 
-            tool.Aggregate.remove_constraints(tool.Ifc.get_object(element))
+            tool.Aggregate.apply_constraints(tool.Ifc.get_object(element))
 
             # Removes Pset related to Linked Aggregates
             if not element.is_a("IfcElementAssembly"):

src/bonsai/bonsai/tool/aggregate.py

@@ -90,6 +90,9 @@ class Aggregate(bonsai.core.tool.Aggregate):
         parts = ifcopenshell.util.element.get_parts(agg_element)
         parts_objs = [tool.Ifc.get_object(p) for p in parts]
         for obj in parts_objs:
+            if not obj.data:
+                continue
+            tool.Geometry.lock_object(obj)
             constraint = next((c for c in obj.constraints if c.type == "CHILD_OF"), None)
             if constraint:
                 obj.constraints.remove(constraint)
@@ -97,9 +100,8 @@ class Aggregate(bonsai.core.tool.Aggregate):
             constraint.target = aggregate
 
     @classmethod
-    def remove_constraints(cls, part: bpy.types.Object):
+    def apply_constraints(cls, part: bpy.types.Object):
         constraint = next((c for c in part.constraints if c.type == "CHILD_OF"), None)
         if constraint:
-            part.constraints.remove(constraint)
+            bpy.ops.constraint.apply(constraint=constraint.name)
-
+        tool.Geometry.unlock_object(part)
-