Solution : https://service.sap.com/sap/support/notes/1494716 (SAP Service marketplace login required)
Key words :
italian company code solution, field xblnr_alt remains empty, alternative reference number, official document numbering, official document numbers, official document number, external source system, field xblnr_alt, number ranges, source system
Related Notes :
| 806173 | Empty reference (XBLNR_ALT) when documents posted with IDoc |
| 746162 | Using official document numbering for Italy |