ID:18906 Could not find usable path between <name> and <name> because routing required for this path is reserved for another source

CAUSE: A previous compilation staged used routing that is now required for the specified connection. The original routing is preserved and cannot chance its source, making the specified connection unroutable.

ACTION: If the source or destination of the specified connection is constrained, relaxing the constraint may allow for an alternative routing path to be used. The source and destination design components could also be placed and routed in the same stage as the conflicting entity to allow for maximum flexibility in resolving routing conflicts.