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The underlying domain has the Rigid Material material model.
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The boundary or its underlying domain is constrained by, for example, Fixed Constraint or Prescribed Displacement.
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If only one side of the contact pair is within a physics interface that has a Contact node, that side must be the destination side.
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The automatic pair generation will not know which side to use as source or destination. Based on the suggestions in Selecting Source and Destination above, you may need to switch selections using the Swap Source and Destination () button in the Source Boundaries section of the contact pair settings.
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You cannot mix contact pairs with the two different types of Mapping Method within the same Contact node.
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