Solution : https://service.sap.com/sap/support/notes/1138351 (SAP Service marketplace login required)
Key words : 
adjusted background job schedule routine, traffic light dialog box, import spam/saint version 0027, background job saprupgm, import support packages, support package manager, install add-ons, update spam/saint, spam/saint version 0026, spam/saint version 0027
Related Notes : 
       
| 1346046 | Enhancement Framework: Performance problems | 
| 1132422 | ENH_CREATE_ENHCROSS: DEAD LOCK | 
| 1062559 | XPRA_UPG phase hangs due to database table DWTREE | 
| 954792 | Known problems with Support Packages in SAP NW 7.1 AS ABAP | 
| 822379 | Known problems with Support Packages in SAP NW 7.0x AS ABAP |