Hi Ryan,
I believe the JobCost report files are numbered based upon the location of the report within the Reports menu structure. Since the Job Summary report is the first report listed in the first report section, it is AJC1100.rpt.
Another example would be the Billing Worksheet report, which is in the fifth report section and the 2nd report listed, thus the report name is AJC5200.rpt.
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Regards,
Softrak Tech Support