diff --git a/pelicun/model/demand_model.py b/pelicun/model/demand_model.py
index 0a7e38bae..be1c88e30 100644
--- a/pelicun/model/demand_model.py
+++ b/pelicun/model/demand_model.py
@@ -1360,6 +1360,60 @@ def _assemble_required_demand_data(
 
             edp_values[edp] = demand
 
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         # evaluate expression
         if expression is not None:
             # build a dict of values