Thanks, Rahul Kumar, Here is the complete expression, Well, I can tell. There was no the attribute 'Calculated ECProperty Specification' for the GASKET's SERVICE in the default project 'OPModeler_Metric'. One day in the past, I put PIPING_COMPONENT into the baseclasses list of GASKET so that I can get it reported with the other piping components. I did try a lot. First of all, a simple expression of a fixed string is not acceptable, the property SERVICE of a GASKET must inherited from an adjacent component or the pipeline where it locates. And I did override the property SERVICE, with the same ECExpression and a simple regular expression, but the furthest where I can go is to be able revising the failure gaskets one by one. So, that's the Q2. Regards,
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