Error - 'One or more transactions have been matched to a Purchase Order and cannot be deleted'

This is a known issue that has been reported to the development team for addressing.
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If you have the Corrections tool then you can delete the transaction from within the Purchase Transaction enquiry screen - amending the search options to include batched items so that it becomes visible.
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If the Corrections tool is not available then the data can be amended by Support to allow deletion from the batch. To resolve this issue - our support team will need to investigate, run scripts or liaise with the hosting or development teams. Any Issues with contacting us, please see the following Get support in Access Financials.