Solution : https://service.sap.com/sap/support/notes/2175161 (SAP Service marketplace login required)
Key words :
components bc-db-ora oracle priority hot news category program error validity, customer component bc-db-ora-sys database interface / dbms, choose generic installation options - oracle - preparations - operating system users, / __%pdfstyle%__font-size, __%pdfstyle%__ / } symptom, oracle/unix mcod installations, installed <sapsid>adm user, oracle_home=/oracle/<mcod_dbsid>/121, software component version, create database sid