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Go to the Invoice Register and choose your invoice record.
Click on the Invoice Number to open the invoice
Select the red 'Delete Invoice' button
Read the warning - If the Invoice has been posted to the external accounting system then you need to delete it from there as well. Once read and actioned, you can press the delete button.
IMPORTANT: There is a checkbox on this screen that is ticked by default. this allows the records that were billed on this invoice to be rebilled after this invoice has been deleted.
If you untick this checkbox, these records will no longer be available to bill.Records that were created on a blank invoice (not within the Time, Fixed Fee, Disbursement or Recovery sections of the OWL) will not be available to bill.
If necessary (I.e. if your invoice was posted before deletion), go into your external accounting system and delete the invoice there as well.
There is often a search system to be able to find transactions by their reference number or amount in accounting systems.