Solution : https://service.sap.com/sap/support/notes/434260 (SAP Service marketplace login required)
Key words : 
rfc/server group & additional key words saplspbt lspbtu01 spbt_initialize sapmscc1 rsclxcop message x834 raising no_pbt_resources_found, abap runtime error message_type_x, deactivated server group, message ta 269, server group, attached corrections eliminate, client copy terminates, active server, delivery error, client copy
Related Notes : 
       
| 212727 | CC-INFO: FAQs for parallel processes up to Release 4.6D | 
| 206523 | CC-RELEASE: Client copy errors in 4.6C and 4.6D | 
| 161495 | CC-RELEASE: Error in client copy in 4.6A and 4.6B |