Under Price alternatives you select the price alternative on which you want to base the forecasts. You can select one of the different fixed price alternatives that exist, as well as your own price lists registered in the Price Lists procedure in the Global Settings module.
By selecting a price alternative, the forecasts are converted into currency amounts (money). For sales forecasts, a sales price according to a registered price list is usually selected. When printing manufacturing forecasts, the Standard price is usually selected.