The manual says

the surface is not adjacent to quadratic elements the faces of which belong to a contact surface.

but it seems to work correctly when the surface is faces of quadratic elements and other faces of those same elements belong to a surface-to-surface contact as either master or slave.

This can be a common situation for pretensioning a bolt whose shank has contact with the hole it’s in.

Does anyone know what situations cause the problem it warns about?

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