Read Design is the way to read the layout - the information about tables and fields - from a DataSource. Reading the design is necessary in order to be able to lookup table- and field names when editing the transfer setup.

Read Design is done from the single DataSource in question. Go to the Configure tab and select the DataSource you want to Read Design for. Then click the Read Design button.

You will need to do the Read Design each time you have changed the layout of the tables/objects that you are working with (if you want to transfer data to/from these fields).

Note: If you dont see the Read Design button to the right of the Test button, its because you dont have access to Edit Transfers. You can contact RapidiOnline support to get access to Edit Transfers.