ID:20460 Logic module atom "<name>" in position "<number>" of the propagate carry chain has an invalid propagate tie off property.

CAUSE: In propagate carry chains, atoms in odd positions of the carry chain must have the propagate_tie_off parameter set to vcc and atoms in even positions must have the propagate_tie_off parameter set to gnd.

ACTION: Set the propagate_tie_off parameter to vcc for atoms in odd positions and gnd for atoms in even positions.