Thanks for your answers!
Create virtual transactions I think it does not help us plan our budget completely, continuing the example of budget of €300 in monthly food.
It is not automatic, if I create a virtual transaction €300 per month for the last day of each month in the scheduler works well!!, we have a forecast of an expense, but in the calendar where I can see the estimated daily balance is not real, I can buy the food category during the present month distorting the real amount, because I will have (in calendar) the total of the transactions that have actually spent plus virtual transaction.
If that virtual transaction will be automatically adjusted according to the selected category spending, the amount provided for the period would be real and not accumulated with the real transactions.
Another problem in managing the budget, is that I can plan €300 for food per month and use virtual transactions to estimate the money that I have but a virtual transaction is related to an account, for example bank account, but the food budget can buy with a bank account, or other bank account, or cash, etc
I think we need something to properly manage budgets and forecasts of balance. What do you think?