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In OpenPlant Modeler CONNECT Edition, requirement is to add dimensional unit to added or existing property in OpenPlant Modeler CONNECT Edition.
In OpenPlant Modeler CONNECT Edition, for a custom added property user can add its dimensional unit using OpenPlant Project Administrator CONNECT Edition. Below wiki article explain the procedure to achieve this requirement.
If above problem still persists, then please create a Service Request and contact the Bentley Product Advantage group. Please include a list of all relevant details to get in depth analysis for a solution or workaround.