User unable to send remittance BACS emails

When in the BACS window, if you click the Print button, it will generate a report of the list of payments that you can currently see. This is for your own reference, and isn't an actual remittance.
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To generate and send the remittance, double-click the transaction to generate, and then click the green tick, and choose to save to printer/file/email. This will generate the payments and you can send the remittance letters to the suppliers from there.