You can reverse bills from past periods if they’re unallocated.
To check if a receipt is allocated, select the Processing menu and choose Edit invoices.
To check if you can deallocate allocations, select the Processing menu and choose Receipts.
Reverse a bill
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Select the Processing menu and choose Billings.
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Hover over the New Batch button, select the drop-down icon and choose Reversal.
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Complete the New Reversal Item fields and save your changes.