Field help (ENVEXTBUD) 

'Off-budget' indicator. The 'Off-budget' box allows the creation of an envelope, its budgets and its budget lines with no amount. Entering amounts is prohibited. Validating 'Off-budget' budget lines allows the entry of purchase requests, orders and invoices on these budget lines, resulting in a negative balance of the budget lines, budgets by FY and envelopes, without overrun limit.