** ERROR 301960 ** Node %7d has overmolded tetrahedral elements of different types attached to it.
When overmolded tetrahedral elements touch each other each element requires its own unique nodes. Nodes are being shared at the element interfaces, which is not allowed.
Ensure that the two overmolded tetrahedral elements each have their own nodes at their interfaces. Make two copies of the model in question and with the one model delete one type of overmolded elements and with the other model the other type of elements. Purge the unconnected nodes in both models and add the one model to the other model and then add this model to the part model. Do not do a global node merge after this operation.