The warning may repeat several times for the same design object.
Older versions of Autologic may write out percent signs (%) in their instance names. Although this is legal in Mentor schematics, it is NOT legal in Xilinx netlists. To remedy this, EDIF2XNF changes each "%" in a netlist to "$37$" (so used because 37 is the ASCII code for the percent sign). Unfortunately, the Mentor back-annotation file is written with this change, so that I1101S$37$5 in the MBA file does not match up with the true I1101S%5 in the schematic.
In the $LCA/com/sparc (or $LCA/com/hppa) directory is a script called mbapp.nawk. This NAWK script is run during the Timsim8 flow to rewrite a Mentor back-annotation file into a more compact form. Since this script rewrites the MBA file, it can be used to change MBA netnames as needed.
A modified version of this script is available that will change the $37$'s back to %'s, so that the offending names in the back-annotation file correspond to those in the front end. This script is located on the Xilinx FTP site at: