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In Qlik Sense i have created bar chart showing Actual Vs Forecast for last 6 months.
My requirement is if any of month has missing actual or forecast then that month should not display on chart.
You can uncheck "Include Zero Values" from Add-ons-->Data handling. It will hide the month having no values.
Try to put something like this in your bar chart dimension:
=If(Actual>0 and Forecast>0,MonthYear)
May be, Try to Uncheck "Include zero values" option in Add-In.