Its
4th generation of SAP production it mains the development process of SAP products those are
1: R/2 (Real time, 2
tier)
2; R/3 (Real time, 3 tier)
3: SAP ERP 2004
4: S/4 HANA is released in
March 2015.
As shown below S/4HANA is replacing SAP ERP enhancement package
