In OpenPlant Modeler, there are many components that doesn't have dedicated icon for its placement but spec database have records for them. In some case, tool icon as well as spec records are present but are unable to place the components. This is due to missing mapping of spec table name. Below article explains how to fix such type of issues.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/31414.how-to-calculate-the-property-value-with-help-of-ec-expression
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