In self-service, a worker submits a request exceeding their entitlement.
What Leave Type validation configuration generates an alert?
Clearing Do Not Allow Request configures the leave validation as a soft error. When the worker submits a request that exceeds the entitlement, Workday displays an alert or warning but allows the request to continue through the Request Leave of Absence business process. The approver can review the warning and decide whether to approve, deny, or return the request.
Selecting Do Not Allow Request would instead generate a hard error. A hard error prevents the worker from submitting the request until the request is corrected or cancelled. That behavior is stronger than the alert requested in the question.
Allow Override for Entry on Behalf of Worker applies when an authorized manager or administrator enters, revises, or corrects leave for a worker. It does not determine whether an employee's self-service validation is a warning or hard error. Hiding supporting data controls whether workers see contextual calculated or report-field values; it does not control validation severity. Custom text changes the wording or additional information presented with the validation result, but it does not convert a hard error into an alert. Clearing Do Not Allow Request is therefore the configuration that produces a warning while permitting submission.