Solution : https://service.sap.com/sap/support/notes/1251291 (SAP Service marketplace login required)
Key words :
wizard page 'main business hours', earlywatch alert hardware capacity checks, maintain table /sdf/main_hours, evaluated 'main business hours', hardware capacity checks, thehardware capacity checks, 'main business hours', sap remote services, compare recent days, st-ser 701_2008_2