the error says something different, there's a conflict between the SAP plugin & Git:
Cannot complete the install because of a conflicting dependency.
Software being installed: Eclipse Git Team Provider 3.2.0.201312181205-r (org.eclipse.egit.feature.group 3.2.0.201312181205-r)
Software currently installed: SAP NetWeaver Developer Studio Product 8.30.10000.111022083713 (com.sap.netweaver.developerstudio.product.complete.extsoa 8.30.10000.111022083713)
Only one of the following can be installed at once:
Core Runtime 3.8.0.v20120912-155025 (org.eclipse.core.runtime 3.8.0.v20120912-155025)
Core Runtime 3.8.0.v20120521-2346 (org.eclipse.core.runtime 3.8.0.v20120521-2346)
Core Runtime 3.5.0.v20090525 (org.eclipse.core.runtime 3.5.0.v20090525)
org.eclipse.core.runtime 3.1.2
Cannot satisfy dependency:
From: SAP NetWeaver Developer Studio Product 8.30.10000.111022083713 (com.sap.netweaver.developerstudio.product.complete.extsoa 8.30.10000.111022083713)
To: com.sap.netweaver.developerstudio.product.feature.feature.group [8.30.10000.111022093330]
Cannot satisfy dependency:
From: SAP NetWeaver Developer Studio Product 8.30.10000.111022093330 (com.sap.netweaver.developerstudio.product.feature.feature.group 8.30.10000.111022093330)
To: org.eclipse.core.runtime [3.5.0.v20090525]
Cannot satisfy dependency:
From: Eclipse Git Team Provider 3.2.0.201312181205-r (org.eclipse.egit.feature.group 3.2.0.201312181205-r)
To: org.eclipse.core.runtime [3.7.0,4.0.0)