This document describes the 'Printer' setting, available in most E-WMS process settings.
For each E-WMS process, it is possible to configure a default printer.
This printer is used only for the E-WMS reports, which are opened first in preview mode. When you would print this report, this printer would be used. Under normal circumstances, this setting can be left to "-- Windows default --". A sample application could be, that you are using a custom report for sales order fulfillment processing (attachment for the delivery note), and need a PDF file of this 'attachment'. Then you could configure this printer default to a PDF printer.
E-WMS reports are optional for each process step, but error reports are always shown. The WMS RF services never print reports - if you need a report, you will have to perform manual actions in the control center.