Import with Mapping with String input is not working

Hello, I am making  HTTP call inside Java Action and java code is returning response as a stringified Json. I am using Import with Mapping with response as input. It has assigned with created Import mapping with appropriate Json Structure and its mapped automatically. Response string(json) is Multi-layered.  Now while accessing output variable, I am only able to access uppermost layer of response. While all other layer shows values as Null. I am not sure why this is happening. Let me know if any one has a clue. Thanks in Advance!  (Modeler version is 7.21.0 which is not available in given list)
1 answers

The import-mapping stores the objects in your database and only returns the root object. You can access the children by activity Retrieve-by-association passing the root-object as the next activity after your Import-activity.