Hello Melissa, Can you try using the following expression for the calculated ECExpression in your VALVE class, COMMODITY_CODE property, to get the same property from the PIPING_NETWORK_SYSTEM class: this.GetRelatedInstance("SEGMENT_HAS_PIPING_COMPONENT:1:PIPING_NETWORK_SEGMENT").GetRelatedInstance("PIPELINE_HAS_SEGMENT:1:PIPING_NETWORK_SYSTEM").COMMODITY_CODE What it does, it goes through the relationship ladder component- piperun- pipeline and gets a property from the pipeline. This seems to be working at my site. For this to work, your properties does not need to be in any way special, any simple property on PIPELINE should work. Regards, Justinas
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