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Currently, Sales representative prompt the first from the list but not the 'Default to cashier when available' as per POS functionality profile setup.

In a large store setup, the sales rep list would be a very long one (50-100 Sales Reps) and quick check out is of the essence; It would really help to make the check-out process quick, efficient and accurate on the till. Based on the current functionality profile setup available for Sales Rep, this could be achieved by defaulting the Sales Rep to the cashier logged in on POS, with the ability to select another Sales Rep or no Sale Rep at all as required, as opposed to selecting the right Sales Rep from the long list for every transaction.
STATUS DETAILS
Declined
Ideas Administrator

Thank you for the product suggestion! We would love to provide this capability out of the box. However, we do not have a planned release timeline as of now and hence marking it as Declined (please read this as Postponed). Meanwhile, for your information that we have made some recent improvements the "select sales rep" dialog to improve effieciency and to better support large lists by adding support barcode scans and searching. - Boyce Zhu, Principal Product Manager for Dynamics 365 Commerce