You can't cancel an invoice if any of these conditions apply to it.  Invoice is validated.  It's matched to a purchase order or receipt.  It's updated with a tax calculation.  It's undergoing approval and doesn't have an approval status of Required or Not required.
You can't cancel an invoice if any of these conditions apply to it.  Invoice is validated.  It's matched to a purchase order or receipt.  It's updated with a tax calculation.  It's undergoing approval and doesn't have an approval status of Required or Not required.
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Why can't I delete an invoice?