Why does Mechanica FEM mode restrain all solid element nodes in the rotational degrees of freedom when exporting a Nastran deck? Usually this hasn't caused me any problems, because Nastran solid elements don't recognise rotational degrees of freedom, but as soon as I connect a beam to a solid element node, the rotations at the beam end are restrained. Checking this in integrated Mechanica indicates that the default in integrated mode doesn't restrain beams ends at solid nodes. Why is this the case for Nastran from FEM? Is there a setting that controls this?