Sales Returns Value and Gross Sales revenue

Hi All,

I am working on implementing a KPI (sales returns value as a % Gross Sales revenue), i would request if any one has experience in implement this in HANA. i am facing challenge in identifying relevant tables and fields which caters the data to this KPI. here with attaching underlying formula used for implementing this KPI

Sales returns value as a % of gross sales revenue = (sales return value/Gross sales or Purchase)*100

Appreciate your prompt response..

Thanks in advance.

Regards,

Sathishkumar.C