When you process expense payments for budgeted and variable expenses, you can set accrual type tolerances or payment type tolerances to determine which payments pass, fail, or cause the system to issue an alert. For details on setting the accrual tolerance fields, see Manage Variable Expenses and and Manage Budgeted Expenses.
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For payments that fail, you can manually update the payment and then modify the status to Full or Partial. You do this only if the payment represents a portion of the overall payment and does not reflect the final payment. You can also record a reason for changing the payment.