how to populate structure inside a structure in FM output

Hi Experts,

I want to populate a structure inside a structure in output of a function module.

Currently I have defined a table type inside a line item i have defined an include structure. But when you append it with values it is not forming the sub-structure in the output. I doubt if this approach is correct for the output requirement or not.

Please suggest how to get this done or provide some sample standard function module which I can refer for this in SAP CRM/ISU.