The aim the Margin Waterfall  page is :

• Provide historical and forward looking view of costs by cost type. 
• Historical data is sourced from the P&L while forecast data is calculated for each cost category & GBU (FL ICM Calculation)

Data accessibility is linked to the visibility model, if your profile does not allow to see costs/ICM data, you will not have access to this page! 

Understand your costs breakdown and the evolution over time. For more details, use the "Margin Waterfall" data set in my data report.