Solution : https://service.sap.com/sap/support/notes/126776 (SAP Service marketplace login required)
Key words : 
db interface  2eetw000 db call info  2eetw000 function, rc=16 ==> calling sapdext  2eetw150 sap_dext called, ~ftp/general/r3server/patches/rel45a/, ~ftp/general/r3server/patches/rel40b/, ~ftp/general/r3server/patches/rel31i/, ~ftp/general/r3server/patches/rel45b/, ~/ftp/general/r3server/patches/rel46b/, technical transport problems importing reports, logical transport problems data dictionary, technical transport problems screens
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