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. Therefore please raise a new case online and reference the title of this article and please include details of the transaction that needs to be deleted.