After having the Job Application disqualified, the candidate is not able to re-submit again to the Job Requisition.
SAP SuccessFactors Recruiting Management
This is an expected behavior.
Candidates are not able to re-submit again to the same Job Requisition that they have been disqualified.
Candidates will only be able to re-apply if their withdrawn their own Job Applications in the mid of the hiring process.
Also, if they try to withdrawn from a Job Requisition that they were already disqualified, the following warning will appear, preventing them to re-apply: "Failed to withdraw Job. You already disqualified for this job.".
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