Hi Krishna,
The sourcing application is the main entry point for purchasers to identify sources of supply. Here, you can create:
Purchase orders, Auctions, Contracts & RFxs only.
kindly go through below SAP Help link:
http://help.sap.com/saphelp_srm70/helpdata/en/d8/33ec56f17f4404806072749f7e764f/frameset.htm
Rgds,
Hitesh