Solution : https://service.sap.com/sap/support/notes/809463 (SAP Service marketplace login required)
Key words : 
transaction re80, usage object, system issues, error message, contract type, terms - reason, program error, error occurs, object assignment, differentiation criterion
Related Notes : 
       
| 774661 | ERP 2004 SP Stack 5 (12/2004) Release and Information Note |