Solution : https://service.sap.com/sap/support/notes/867950 (SAP Service marketplace login required)
Key words : 
number range interval, external number assignment, internal number assignment, document number, -leading ledger, document type, fagl_belnr_ld-numkr, entry view, leading ledger, t003-numkr
Related Notes : 
       
| 959951 | Document number from incorrect number range | 
| 890976 | Converting closing report to internal doc number assgnmnt |