Solution : https://service.sap.com/sap/support/notes/603173 (SAP Service marketplace login required)
Key words : 
relevant support package, modification log files, modification adjustment, customer modification, symptom occasionally, terms spau, cx_sy_import_mismatch_errorreps_sapo_sn_get reason, data inconsistency, format reps_sapo_sn_get, lsemf02 include
Related Notes : 
       
| 782140 | OCS: Known problems with Support Packages in Basis Rel. 6.20 | 
| 447925 | OCS: Known problems with Supp. Packages in Basis Rel.6.20 | 
| 400280 | OCS: Known problems with Support Pkgs in Basis Release 6.10 |