Solution : https://service.sap.com/sap/support/notes/942046 (SAP Service marketplace login required)
Key words :
navigation flow works properly, fields 'start/end time', sap xapp mobile time, terms mobile time sheet, mobile time sheet 2, mobile time sheet, mobile engine window, field customizing shows, pressing 'ctrl+f4', save data prompt
Related Notes :
| 951096 | Mobile applications availability w/ERP05 |
| 892204 | Mobile Time Sheet 2.0 - Composite Note |