Solution : https://service.sap.com/sap/support/notes/548763 (SAP Service marketplace login required)
Key words : 
product version patch level j2ee patch level         xi 1, complete /usr/sap/<sid>/dvebmgs/j2ee directory, sap exchange infrastructure product catalog entry, support package xi reason, 0 sp7 j2ee sp4        xi 1, unlike abap support packages, latest basis support package, sap software delivery manager, patch level combinations, 0 sp7 j2ee sp4you
Related Notes : 
       
| 619598 | Support Package 07 for SRM 2.0 | 
| 559048 | Support Package 04/Service Release 01 for SRM 2.0 | 
| 547725 | Support Package 03 for SRM 2.0 | 
| 544979 | Importing Java Support Packages with SDM | 
| 544244 | Calling the Software Delivery Manager (SDM) | 
| 539539 | Replacing the native libraries of the J2EE engine | 
| 532892 | Installing a new version of the Software Delivery Manager | 
| 529088 | Patches for the SAP J2EE engine | 
| 330793 | Downloading patches |