Time measure (hhmmss) from BW query (Time Key Figure) not displayed on chart in Design Studio

Hi Design Studio experts,

I am encountering an issue in Design Studio (1.6) where time measure (hhmmss) from BW BEx query (using Time Key Figure) are not displayed on any charts.

The time measure (hh:mm:ss) can be displayed on table, but shown as empty on chart. 

For example: Time measure (Avg Delay time) are shown on cross tab.

But on a chart, they are all null. 

If I switch the measure to a quantity measure, the chart is populated.

But as soon as use a time measure, it becomes blank.

Perhaps the chart is treating the time measure (hh:mm:ss) as a string and not knowing how to plot it?

The goal is to reproduce a time chart like this on Design Studio.

     (From Excel)

Does anyone has how to resolve this or any workaround?

Thanks & Regards,

Lawrence