Solution : https://service.sap.com/sap/support/notes/454528 (SAP Service marketplace login required)
Key words : 
additional key words vwu, number range object fvvd_beki, mass changeover terminates, access table nriv, loan document numbers, parallel batch runs, local file + proc, number range, object fvvd_beki, deadlock occurs
Related Notes : 
       
| 179224 | Doc.no.assignment for unbuffered number ranges |