This dialog is shown when you have specified that you want to add data from a data connection and the connection contains more than one view that can result in a data table.
Click to select the data table of interest in the list, then click OK.
If a view has been specified not to allow imported data (hence, if the load method is set to 'External Data Only (in-database)' at the creation of the connection), then you will not be able to select that view in this list. See Details on Views in Connection for more information.