Once Purchase Invoice register invoices have been rejected, they will appear in the Amend Entries screen within Dimensions. These can be deleted - however:
If the invoice has entered an approval process, it must be rejected by the approver before it can be deleted
If the invoice has been matched to an order,. it must be un-matched before you can delete the invoice, please refer to our article on unmatching rejected invoice entries
If you have entered detail lines manually, these must be removed before you can delete the entry
Once you have checked this and ensured that the invoice in question is not awaiting approval from anyone, does not have any detail lines and is not matched to an order you should be able to remove it from Amend Entries.
If the above does not resolve your issue, then as a last resort Support may be able to reset the invoice. If this is required, please raise a new case online and reference the title of this article.