Solution : https://service.sap.com/sap/support/notes/338578 (SAP Service marketplace login required)
Key words : 
tp import <sid>konnn clientxxx <sid> u18 tp import <sid>ktnnn clientxxx <sid> u18 postprocessing, client-specific data <sid>ktnnn, cross-client data <sid>konnn, client-independent data <sid>konnnn, export test run reports errors, transport request <sid>kt, component bc-cts-tls, transport control program tp, transport management system - transaction stms, bc-sec-usr-adm
Related Notes : 
       
| 901256 | Rabax "CALL_FUNCTION_SIGNON_INCOMPL" | 
| 667964 | Client import in queues with more than 9999 entries | 
| 624069 | CC-INFO: tp status incorrect/unknown | 
| 567573 | Client transport of forms | 
| 532565 | CC-ADMIN: Protecting the production client against imports | 
| 518237 | Long runtimes when you set up matchcode records for VMVA | 
| 511530 | TMS client import fails due to unknown system | 
| 503247 | |
| 415561 | Client transport: Selection from SMODILOG not allowed | 
| 355713 | CC-TOPIC: User masters during client copy | 
| 350101 | CC-TOPIC: Client copy and addresses up to 4.6D | 
| 339721 | CC INFO: Subsequent copy of long texts | 
| 323970 | Problem with matchcode DGMI | 
| 206523 | CC-RELEASE: Client copy errors in 4.6C and 4.6D | 
| 180541 | CC-INFO: Performance problem when copying text | 
| 167482 | CC-ERROR: T52CC T52CD TKEB1 TKEBB are deleted. | 
| 144057 | abap/import_char_conversion : How to set best | 
| 103582 | Doc.: Transfer of R3trans options with tp | 
| 102034 | R3trans: Control of the COMMIT intervals | 
| 89384 | Checking cluster tables with R3check | 
| 86535 | tp/R3trans: Splitting large exports | 
| 73779 | AS/400: Problems during client transport R3trans | 
| 70547 | CC-TOPIC: Client transport | 
| 63911 | AS/400: Client import terminates with QAQQPRF (7008) | 
| 41839 | CC-TOPIC: User masters and client copies until 4.0 | 
| 27122 | Converting customer matchcode IDs to transparent IDs | 
| 24860 | Replacement of a matchcode ID by a search help function | 
| 24853 | CC-INFO: Client copy, functionality | 
| 22514 | CC-INFO: Error analysis for client copy | 
| 20823 | R3trans termin.: Cannot write to datafile any more | 
| 15760 | Using SAPMACO for constructing matchcodes (A,S,P) | 
| 5662 | Transporting objects in developm. class TEST, $TMP | 
| 3355 | SAPscript: Transporting styles/forms/texts |