You have to install the custom widget manually.
The relevant functionFlowWidget.zip file is located in your PPM installation folder.
<PPM installation>\ppm\server\bin\work\data_ppm\functionFlow\MashZone_NextGen_BA\customWidgets
Procedure
...\MashZoneNG\apache-tomee-jaxrs\webapps\mashzone\hub\dashboard\widgets\customWidgets
The functionFlowWidget subfolder is created.
The PPM function flow widget is now available in MashZone NextGen Business Analytics.
You can use the widget to insert a function flow chart as dashboard component. See Insert Function Flow Widget in a dashboard for details.