A sales invoice can be edited or deleted only if the customer has not paid for the item, i.e., the Is Paid checkbox was not selected when creating the sales invoice.
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Click module access icon > Administration > Inventory > Billing to open the Invoice page.
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Select a store. All sales invoices of the store are displayed. If you are searching for a particular invoice, select the store and enter the invoice number to search.
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Click Edit to edit the sales invoice, or click Delete to delete the sales invoice.
For more information, watch this-
