Solution : https://service.sap.com/sap/support/notes/82971 (SAP Service marketplace login required)
Key words :
respective developer trace file, error 023for btc processes, error 023 additional key words, messagesfor dia processes, additional spool files, read status entry, wpjobuser = sap00b wpjobno = 049060, os/400 command level, find escape messages, os/400 job id