Source, WS Request Setup
This field contains the source that makes up the node. It can be a fixed text (single node not referring to a table),
a table or a field from a table. This is also the key value which is used by the request service to find
its key fields. The process uses this field to locate the key node and then uses the node name to
find the node in the xml document. So from the requests service point of view the xml document can
hold a different node name as long as this field holds the correct key values.