Solution : https://service.sap.com/sap/support/notes/718912 (SAP Service marketplace login required)
Key words : 
radengen form generate_coding tables dd26e_tab structure dd26e                            dd27p_par structure dd27p                            dd03p_arg structure dd03p, activate rfc-enabled lock objects, template changed      perform syntax_check, -rfc-enabled lock object, rfc-enabled lock object, di829 error message appears, area fname typ errno, structure dd25v, terms lock object, lock function modules
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