Solution : https://service.sap.com/sap/support/notes/1426513 (SAP Service marketplace login required)
Key words :
UMG_CHECK_NAMETAB_TABS, UMG_ADD_DOWNTIME_STEP, DDXTT, DDXTF, DDXTT_CONV_UC, DDXTF_CONV_UC
Related Notes :
1319517 | Unicode Collection Note |
932779 | Unicode conversion - analysis of nametab problems |