In the properties dialog, you will find selection lists,
in which the Web Service Trigger (which is the element that executes the
web service request) and the Web Service Call, the data of which is to be
shown, can be selected. All triggers and calls that are set up on the current
page are available here.
Clicking Add allows the output fields of
the web service that are to constitute the results table can be selected. Only
the fields that have not yet been connected to another control can be inserted
as table columns here. In addition, only sibling nodes may be selected.