Solution : https://service.sap.com/sap/support/notes/431807 (SAP Service marketplace login required)
Key words : 
additional key words /sapapo/bopi, solution apply source code correction, message appears 'error, interactive backorder processing, return code 17832', routine call, processing, prerequisites, notes 432509
Related Notes : 
       
| 446299 | BOP: Problems in the postprocessing | 
| 439745 | BOPI: New delivery schedules / scheduling | 
| 435343 | Backorder processing: Item does not exist | 
| 435292 | BOPI: Changes to subitems are not transferred | 
| 432509 | |
| 430631 | |
| 411548 | BOPI: Termination when saving | 
| 411311 | BOPI: Errors in data processing | 
| 400001 | BOPI: Short dump when saving | 
| 375193 | Backorder processing: Composite SAP note on posting | 
| 360790 | |
| 357633 | |
| 356258 |