fix displaying undefined or userdefined units in cost schedules

src/blenderbim/blenderbim/bim/module/cost/data.py

@@ -158,8 +158,10 @@ class CostSchedulesData:
             unit = ifcopenshell.util.unit.get_property_unit(quantity, tool.Ifc.get())
             if unit:
                 data["UnitSymbol"] = ifcopenshell.util.unit.get_unit_symbol(unit)
-            else:
+            if quantity.is_a("IfcPhysicalSimpleQuantity"):
-                data["UnitSymbol"] = "U"
+                measure_class = quantity.wrapped_data.declaration().as_entity().attribute_by_index(3).type_of_attribute().declared_type().name()
+                if "Count" in measure_class:
+                    data["UnitSymbol"] = "U"
 
         # same_unit_nested_cost_item = set()
         # data["DerivedTotalCostQuantity"] = None

src/ifcopenshell-python/ifcopenshell/util/unit.py

@@ -464,6 +464,8 @@ def get_unit_symbol(unit):
     if unit.is_a("IfcSIUnit"):
         symbol += prefix_symbols.get(unit.Prefix, "")
     symbol += unit_symbols.get(unit.Name.replace("METER", "METRE"), "?")
+    if unit.is_a("IfcContextDependentUnit") and unit.UnitType == "USERDEFINED":
+        symbol = unit.Name
     return symbol