During the starting of CFT in 'No Shared Line' mode, there is an error and the line is not created.
The 'No Shared Line' is actived when, in CFTNET, the parameter MAXLCH, SPEED, PACKETSZ and PACKETW are not equal to zero.
Example :

CFTNET   ID=X25LINE0,              
 13000          MODE=REPLACE,    
 13100          TYPE=X25,        
 13200          CLASS=1,          
 13300          MAXCNX=3,        
 13400          NETPFX=CFT,      
 13600          LINEID=CMN04,    
 13800          MAXLCH=3,        
 14100          SPEED=14400,      
 14300          PACKETSZ=128,    
 14500          PACKETW=3

The error messages in the LOG of CFT are :

80  INFORMATION  RES_DEFA-001 *  Ressource define ERROR * message ID :CPC2607 *
CFTTPRO1   CFT        019664 SI_WTO76     0000 08/02/07 14:20:47,095416 CFT
80  INFORMATION  Ligne CFTLX04 mise en fonction.
CFTTPRO1   CFT        019664 SI_WTO76     0000 08/02/07 14:20:47,095752 CFT
80  INFORMATION
CFTTPRO1   CFT        019664 SI_WTO76     0000 08/02/07 14:20:47,096000 CFT
80  INFORMATION  ===>A25SERV-x25-110 * Ressource-def ERROR * cr=9 * class=1 *
CFTTPRO1   CFT        019664 SI_WTO76     0000 08/02/07 14:20:47,096256 CFT
80  INFORMATION  CFTI21F ID= X25LINE0 Ressource define failure CS=0001FFF3 NET=
CFTLOG1    CFT        019662 SI_WTO76     0000 08/02/07 14:20:47,097408 CFT
80  INFORMATION  CFTI15F Error code 0001FFF3 _ Trying to define ressource X25LINE0
CFTLOG1    CFT        019662 SI_WTO76     0000 08/02/07 14:20:47,104328 CFT

There is also a message in QSYSOPR

The 'No Shared Line' mode is not supported any more with OS400 V5R4.
Now it is necessary to use the 'Shared Line' mode with, in CFTNET, the parameter MAXLCH, SPEED, PACKETSZ and PACKETW set to zero.