Recently I have seen quite a bit of requests come my way to understand the compatibility of different versions of SPM with different versions of SAP Sourcing (formerly e-Sourcing).
I will be posting more details on this soon.
For more information on SPM and SAP Sourcing integration pls check out the following resources:
1) SPM Application Help guide: link http://help.sap.com/content/bobj/sbu/docu_sbs_xsa_design.htm# >> Select Version >> Open the Application Help >> Click "Integration" chapter
2) Value Prop:
Demo Integrated Sourcing and Procurement > http://www.sap.com/solutions/sapbusinessobjects/large/enterprise-performance-management/spend-performance-management/demos/index.epx