Budgeted amount of the reserved budget, ex-tax. Optional field that can be entered when creating the budget. The reserve is included in the budget, this amount must be strictely lower than the budget amount. The budget amount, minus the reserve determines the available amount that can be divided in budget lines. This reserve can be used throughout the envelope's life, before or after approval The lower the bugdet reserve amount, the higher the left-to-distribute amount. The higher the bugdet reserve amount, the lower the left-to-distribute amount. After approval, it is limited to the available amount, left-to-distribute in budget lines.