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You have couple of options here:
1. Consider to change the flag to "Do Zero Forecast", thus forcing engine to generate a ZERO Forecast for such old/inactive/disabled items. You will have to also get rid of any manual forecast overrides which you may have done in other series to completely reduce final forecast to ZERO.
2. Check out "ResetForeVals" parameter in System Parameters > engine > Shell tab of business modeler. You may consider setting this parameter to a value of "Yes" or "All". Remember that a setting of "All" will affect engine run time, mainly the amount of time engine would take to clean up the FORE_X column prior to generating a new forecast.