ID:186487 Ignored assignment to node "<name>" because it is part of a carry or cascade chain
CAUSE: The Fitter ignored the assignment made to the specified node because the specified node is part of a carry and cascade chain. When applying these assignments, the Fitter does not lock down any registers which are part of a carry or cascade chains.
ACTION: Delete the assignment from the node and set tight timing constraints in order to instruct the Fitter to optimize I/O to register connections.