This document describes how to build an interface between a BPS planning layout in Excel and a transactional ODS to maintain comments directly in the planning screen. It discusses the required BW data model, integration with ABAP function modules, and provides sample code for read and write modules to store comments from the layout in the ODS and retrieve them to display in the layout. Maintaining comments directly in the planning layout provides a more customized solution than attaching documents, though it can impact performance.