Solution : https://service.sap.com/sap/support/notes/1583404 (SAP Service marketplace login required)
Key words :
/sp-stacks -> sp stacks maintenance schedule, activated multi-language support, kmc web page composer 7, web page composer, schedule details, page group, symptom pages, sap netweaver 7, longer visible, initially assigned
Related Notes :
| 1371703 | WPC for SAP NetWeaver 7.3 - Upgrade Information |