Solution : https://service.sap.com/sap/support/notes/837691 (SAP Service marketplace login required)
Key words : 
support packages    sapkb46c50   sapkb46d40   sapkb61043   sapkb62050   sapkb64012   sapkb70001 solution, symptom background jobs disappeared, support package status mentioned, higher basis support package, basis support package, terms sap_reorg_jobs reason, external job scheduler, support package, basis releases 4, program error
Related Notes : 
       
| 856093 | BP_JOB_SELECT: Job name parameter | 
| 835846 | BP_JOB_SELECT: Jobs are not selected correctly | 
| 822379 | Known problems with Support Packages in SAP NW 7.0x AS ABAP | 
| 782140 | OCS: Known problems with Support Packages in Basis Rel. 6.20 | 
| 715355 | BP_JOB_SELECT: Optimizing the job selection | 
| 672651 | OCS: Known problems with Support Packages in Basis Rel.6.40 | 
| 400280 | OCS: Known problems with Support Pkgs in Basis Release 6.10 | 
| 173814 | OCS: Known problems with Support Packages for Release 4.6 |