Hi Al,
As stated by vinod,
Take some combination(PO number and for month wise or quartely) of records form source tables, screen shot.
Enter the same selections at ECC tx - RSA7, execute it, have screen shot(not mandatory)
Again same records/selections take from dso or cube from out display (not mandatory)
Run bex report for same selections and copy all results on excel and send to your team.
Thanks