Unable to change the Start date of the Week in Time Scale Value views from Monday to Sunday

Document ID : KB000109739
Last Modified Date : 03/08/2018
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Even though Start Day of Week is set to Sunday in Project Management Settings, unable to see the TSV (portlet time scaled value) data start on Sunday.
This is working as designed. As referenced in the documentation, the setting 'Start Day of Week' in Administration->Project Management->Settings is used for Resource Calendars and Schedulers (such as Open Workbench (OWB)).

Time Scale Value grids in Classic PPM (for non-fiscal calendar TSV periods using a weekly scale) will use the Datamart ISO calendar. (See more details on the Datamart ISO calendar at: KB000027248)

Exceptions where you are able to specify a different start day aside from the ISO Standard day of Monday would include Time Reporting Periods, which uses a separate setting. There are also some reports that utilize parameter settings.