Hi,
Your report is balance sheet P/L report.
Go to your Tx -S_ALR_87012284 At ecc side, menu system-->status-->program. Double click on it or copy program name and open thru SE38. in program code you may see the base tables.
Coming to bw side, Data source 0FI_GL_6.
to know the more information about financial statements please check wtih FI team or FI forum here.
Requesting Amit Dahiya, Gajesh Nagesh and Sander van Willigen to help
Thanks