ID:170101 Signal "<name>" in line <number> of Routing Constraints File exists but is not routed. Routing constraints cannot be used for this signal

CAUSE: You specified that the Fitter use the back-annotated routing constraints during compilation.However, the specified signal in the specified line of the Routing Constraints File (.rcf) is not routed because there is only one connection from the signal's source to its destination. As a result, the Quartus Prime software is ignoring the routing constraints for the signal.

ACTION: No action is required.