ID:170239 Router is attempting to preserve <percent> percent of routes from an earlier compilation, a user specified Routing Constraints File, or internal routing requirements.

CAUSE: The Quartus Prime software is informing you the percentage of the design that will try to preserve a previous routing result. The routing constraints being used are a combination of previous routing results for partitions using a Post-Fit netlist and preserving placement and routing, any user specified Routing Constraints File (.rcf) and internal routing requirements. To view the actual amount of the design that preserved routing, see the Incremental Compilation Preservation Summary panel in the Fitter report.

ACTION: No action is required.