Action the Remittance BACS process and create a BACS Export file up to a week in advance of the payment date, but email the remittance advice to the supplier on a designated date

Unfortunately it is not possible to carry out the Remittances BACS process and email the remittance advise to the supplier on a designated date. This would require some serious modifications to your Dimensions system and it would prove to be very expensive.
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If this is a change you're interested in then you can raise this with your Customer Success Manager to obtain a quote.