Hi Peter,
I feel, the issue is that the Advanced --> Custom Series options. It expect a valid JSON object, but the settings may not be applying correctly. Try the following:
Go to the Advanced tab of the chart widget.
Under Custom Series, add the following JSON for your second series - { "type": "line"}
Ensure that this JSON is correctly assigned only to the second series and not the entire chart.
If it still does not work, try adding this under Custom Layout in the Advanced tab -- { "barmode": "group"}
This ensures that the bar and line chart render correctly together.
The problem is solved, I think it's a bug. The line specified by Srinivas works as long as developer mode is turned of while publishing the app.
So :
{
"type": "line"
}
is correct defining it, in the Custom Series tab of the 2second series, shows a linechart for the 2second serie.
But have in mind: set developer mode off before deploying it, otherwise it is shown as a bar.
Kind regards
Peter