Solution : https://service.sap.com/sap/support/notes/376214 (SAP Service marketplace login required)
Key words : 
individual data files, set filesplit parameter, 6d kernel ein, current tp patch, 'getspacerequirements' tp command, patch level >= 412, error occurs, continuation file, transport request, export occurs
Related Notes : 
       
| 318846 | Installing the 4.6D kernel in 4.6A/B/C SAP systems | 
| 86535 | tp/R3trans: Splitting large exports | 
| 19466 | Downloading SAP kernel patches |