The ONCC Black Box node is a catch all for unsupported nodes in N2FE. It allows nodes
to be utilized in the flow but prevents the nodes internal structure from being altered.
The node displays its name, type, and ACS node number. Nodes can be added to and removed
from exits, however the internal structure of the blackbox node is hidden.
On saving the flow, the blackbox node retains its previous internal structure.
