Solution : https://service.sap.com/sap/support/notes/316996 (SAP Service marketplace login required)
Key words : 
additional key words sis, attached source code, delivery items, order reference, update groups, program error, solution implement, reorganization, deliveries, determined
Related Notes : 
       
| 204130 | SIS update: Collective note | 
| 182604 | Statistics update for delivery item without order reference | 
| 174134 | SIS: Collective note - reorganization | 
| 140278 | Statistics group customer f. deliveries w/o SD ref. | 
| 140208 | SIS reorganization: Deliveries without order reference | 
| 79319 | SIS: Diff. between online/simulation/analysis/reorganization |