Hi, Jennifer,
Can you verify which release date of AR9.0A you are using? You can get this information by selecting Help | About from the main menu. The date is in parentheses to the right of the version code.
We did have a report of this error by someone who had made multiple adjustments to a customer invoice. If the statements were backdated to before those adjustments, they printed without an error.
If you're running the current SP release (090928) or later, the problem should be resolved.
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Regards,
Softrak Tech Support