If the request message contains an element, for example, phone number of type work of an employee, that occurs multiple times, the input fields for this element must come from different source groups.

To create a request for relational sources, link the source group in the input fields to its parent source group by using the foreign key.

To decide the parent source group for multi-occurring elements, you must perform the following steps:

The parent group must be the immediate multi-occurring parent element.
In the absence of a multi-occurring parent element, map the multi-occurring element to the source group that is mapped to the root element.

For example, the following image shows the mapping of the multi-occurring element

work

from the relational data source to the REST V2 target: