This document explains how to enhance a LO data source by appending a new field to extract additional data. Specifically, it describes appending the material type (MTART) field from the MARA table to the 2LIS_11_VAITM data source. The steps include checking for the field in existing communication structures, appending the extract structure, writing ABAP code to populate the new field during extraction, and configuring the data source metadata. Performing an extract check confirms the field is now being extracted.