Solution : https://service.sap.com/sap/support/notes/1056644 (SAP Service marketplace login required)
Key words : 
runtime exception occurs, prerequisites program error, solution note 877887 describes, sap service marketplace, terms order change, existing order, order save, symptom log, 0 application
Related Notes : 
       
| 1055140 | ECO ERP: Order Display gives Nullpointer exception | 
| 1046863 | SAP ERP 2005 SP Stack 09 (05/2007) Release Information Note |