Solution : https://service.sap.com/sap/support/notes/456996 (SAP Service marketplace login required)
Key words :
time scales changed user-specifically, respective support package status, user-specific time scales, user-specific settings, incorrect time scales, network transactions cn21, create include fcjgrf01_set_grid_mode, time scale assistant, time scale profile, time scale editor
Related Notes :
517861 | PS information system:Sending the GANTT chart and time axes |
423051 | Follow-on note for user-specific time scale settings |
371842 | Customized options, time scales, and field selection |