Solution : https://service.sap.com/sap/support/notes/771209 (SAP Service marketplace login required)
Summary : 
      This SAP Note provides guidelines for copying an NW system using R3load, highlighting tasks before, during, and after export and import processes. It specifies general prerequisites for SAP kernel 6.40 and higher, and patch levels for R3load, BW 3.5, and Basis 6.40. For effective database object management across systems, engage SMIGR_CREATE_DDL for generating DDL statements for native SAP and non-standard database objects. Key post-migration tasks involve running RS_BW_POST_MIGRATION to update database-specific entries and configurations, ensuring database coherence and operational stability across heterogeneous or homogeneous system copies.
Key words : 
im04_aix_64/sapinst/unix/aix_64/nw04sr1/webas/abap/db6/, cd51030944 sap netweaver 04 sr1 kernel db2 udb, support package/tool patch level r3load >= 17 bw 3, cd51030958sap netweaver 04 sr1 unicode kernel db2, system adjusts database-specific ddic entries, special database platform maxdb---------------------------------- program smigr_create_ddlyou, special oracle database platform----------------------------------- program smigr_create_ddl, 300 -merge_bck -stop_on_error -nolog]]> </strval>important, iseries inplace unicode conversion, sap erp central component 4
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