Open a mapping pane and right-click the source node that
you want to map.
Select Select One Occurrence from
the list. The Select One Occurrence dialog box
opens.
This dialog box displays the path to the source node you
have chosen with an occurrence property for each recurring level.
Select the number of occurrences to use at each recurring level.
Click OK. The source node is highlighted
in red in the Mapping Editor.
Select the source node and drag it onto the destination
node to complete the mapping.