Why is PML being error-trapped in a modal analysis at ANSYS 11.0?

That error trap was added because modal results with PML were possibly incorrect and the runs sometimes failed. The PML is like a form of high damping, so doing an undamped modal on it is not valid. If the user was getting something useful from his modal analysis of models with a PML, he might be able to issue "/NERR,,,-1" to make the run continue past the error message.

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