Solution : https://service.sap.com/sap/support/notes/449708 (SAP Service marketplace login required)
Key words : 
img activity 'customer relationship management -> billing -> system enhancements -> edit metadata', additional key words generation, billing engine framework, entry crm billing, crm billing application, entry generate application, metadata link, crm billing, entire application, automatic generation
Related Notes : 
       
| 663180 | Support Release 01 for CRM 3.1 | 
| 653691 | SAPKU31006: Support Package 06 for CRM 3.1 | 
| 646661 | SAPKU30016: Support Package 16 for EBP 3.0/CRM 3.0 | 
| 645154 | Runtime error when you distribute business transactions | 
| 577585 | |
| 555033 | Billing block in delivery-related billing | 
| 544337 | |
| 524977 | |
| 495489 | |
| 495188 | |
| 491626 | |
| 487753 | |
| 482263 | |
| 481075 | |
| 480621 | |
| 459082 | |
| 454721 | Syntax error when deactivating features | 
| 450821 | |
| 439494 | Regeneration of objects of CRM billing | 
| 438409 | |
| 437284 | SAPKU30005: Support Package 5 for EBP 3.0/CRM 3.0 |