Converting an Instance of Integration Object with two IC into single record hierarchy

Hello All,

I have a requirement of converting external message(contains multi level hierarchy) into single hierarchy to display in single record in the UI.

External Message

First External Message

Level 1

     Level 1.1--- Siebel

     Level 1.2-- CRM

Second External Message

Level 1

     Level 1.1---Siebel

     Level 1.1.1---CRM

I want to display in the UI as "Siebel CRM" by converting above two types of external messages.

I have tried by creating one IO and IC. Used Data Mapper to convert(Mapped external two IC's to same internal IC) but the message is being displayed in two rows.

Please help on this how to display in the single record