Doubt in Report generated at epdev/irj/portal

Hi,

I would be thankful if anyone can help in knowing that what are the ECC tables ( how to know that from which table the data has been taken) from where the data has been pulled to develop SAP BW report and hence generate it on epdev/irj/portal. For details please refer the below screen shot of one of the reports generated in the epdev/irj/portal.

Thanks and Regards

Ranendra