Field help (ENVFIYEND) 

End date of the FY budget. Date loaded, cannot be modified, for the end date of the budget envelope for an annual envelope. For a pluriannual envelope, this date is loaded (and cannot be modified) by the end date of the envelope if the budget corresponds to the last budget of the envelope. For previous budgets, this date is loaded (and cannot be modified) by the end date of the FY.