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The only way to modify an existing Journal Entry is to delete the Journal and re-enter. To pull existing Journal Entries all you have to do is select from Orders, Opportunities, Service Tickets or Vendors and key in the Project # or Name. Hit ENTER on your keyboard and the Journals will populate on the lower portion of your screen. You then have the ability to highlight an entry and select DELETE on your keyboard.
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Note: You can modify, add or remove Journal Categories in your Drop Down List Setup. See here for additional information.