diff --git a/kadmos/graph/graph_kadmos.py b/kadmos/graph/graph_kadmos.py
index 2f0d0d4677e37bb616a7bf48bd7806bc3c72b481..86ac775ac70458e9b63f1ece6f3057fa52107033 100644
--- a/kadmos/graph/graph_kadmos.py
+++ b/kadmos/graph/graph_kadmos.py
@@ -1060,7 +1060,7 @@ class KadmosGraph(nx.DiGraph, EquationMixin, VistomsMixin):
             cmdows_parameter.add('instanceID', instance)
 
             if instance > 1:
-                cmdows_parameter.add('relatedInstanceUID', self.get_first_node_instance(self.nodes[graph_parameter]))
+                cmdows_parameter.add('relatedInstanceUID', self.get_first_node_instance(graph_parameter))
 
             else:
                 cmdows_parameter.add('description', self.nodes[graph_parameter].get('description'),