Hello,
For SAP NW system,
EHP1 for SAP NW 7.0 ==> SAP_BASIS 701
EHP2 for SAP NW 7.0 ==> SAP_BASIS 702
EHP3 for SAP NW 7.0 ==> SAP_BASIS 731
For ERP system,
EHP1 for SAP ERP 6.0 ==> SAP_APPL 601
EHP2 for SAP ERP 6.0 ==> SAP_APPL 602
EHP3 for SAP ERP 6.0 ==> SAP_APPL 603
EHP4 for SAP ERP 6.0 ==> SAP_APPL 604
EHP5 for SAP ERP 6.0 ==> SAP_APPL 605
EHP6 for SAP ERP 6.0 ==> SAP_APPL 606
Regards
Rahul