Many time develop with PLC to consider that choosing which version to use the CPU will have enough space to run the program.So,I have good article to fix this problem.
http://omron-plc.com/2011/02/16/reset-crossreference-report-omron-plc/
http://omron-plc.com/2011/02/16/reset-crossreference-report-omron-plc/