Hi Suzanne,
Thats a "broad" question in terms of trying to pin down a specific report for you...
Many of the standard purchasing reports can me found in the "ME" series....
ME2M, ME2L, ME2C, ME81N,
Vendor master
MKVG , MKVZ
Material
MM60
You can find all of these under Logistics - Material Management - Purchasing - Then find the area you are interested in and look for "list display"