Hi, Samuel,
Okay. You're backdating a report, so it will try to use the transactions that are in history. If some of the necessary transactions have been cleared, the report is only able to report on what is there.
Also, when you say that DIC is clean, in the Company Profile on the System Options tab, is the 'Check history during DIC' option enabled? If not, enable it and run DIC again to see if it reports any errors.
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Regards,
Softrak Tech Support