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Altair Inspire checks for potential problems with the model before running an analysis or optimization and will suggest solutions when problems are found.
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The section contains information about how to resolve modeling errors in Inspire Motion.
Analyzed Part Cannot Be Assigned a User-Defined Mass or Inertia Properties

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    - Modeling Errors and Alerts
      The section contains information about how to resolve modeling errors in Inspire Motion.
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Analyzed Part Cannot Be Assigned a User-Defined Mass or Inertia Properties

Condition

When using Analyze Part, mass and inertia properties cannot be overridden (customized).

Remedy

Define a user material with a density that will align the mass and/or inertia properties with the desired properties, then assign the user material to the part(s).