Have you set the keyword AUTO_FORECAST_DAYS in the variable UC_CLIENT_SETTINGS variable and then ran the AUTOFORECAST() script yet? If not, set it to 30 days and when you run the script, it will generate the forecasts for the 30 days. You may have to set the keyword AUTO_FORECAST_PREFIX in the same variable. Depending on the number of schedules and workflows in those schedules, it could take a while to run. You can monitor it by opening the Forecasts button and refreshing it occasionally.