Stock Ledger Analytics should provide what you need. Some information can be found here: help.sap.com > SAP NetWeaver > BI Content > SAP NetWeaver 7.0 BI Content Add-On 4 SP 06 > Industry Solutions > Trading Industries > Retail Trade > Supply Chain Analytics > Stock Ledger Analytics (Link: http://help.sap.com/saphelp_nw70/helpdata/en/1c/8451a1005f4371b9c630a285ea7a7d/frameset.htm)
The site wise stock report can be found using the T-code MCGD. However for this RIS needs to be activated in the system. Site wise Stock report can be found from RWBE
