Solution : https://service.sap.com/sap/support/notes/552029 (SAP Service marketplace login required)
Key words :
function group /sapcnd/maintenance_ow, message class /sapcnd/maintenance, create include /sapcnd/lmaintenance_owf24, condition maintenance reason, program /sapcnd/saplmaintenance_ow, activated trace log, terms condition technique, 745message short text, 746message short text, condition record found