Solution : https://service.sap.com/sap/support/notes/816523 (SAP Service marketplace login required)
Key words : 
read file usr/sap/trans/sapnames/username, system immediately issues error message pu 807, usr/sap/trans, imported basis support package 47, sap note assistant, relevant support package, error message, support package 11, program error, implemented note 803847
Related Notes : 
       
| 1161922 | Termination PU 807 when user logs on | 
| 782140 | OCS: Known problems with Support Packages in Basis Rel. 6.20 | 
| 672651 | OCS: Known problems with Support Packages in Basis Rel.6.40 |