From page D-10 of the GIR
3. Application date—reinstated application. If, within the same calendar year, an applicant asks an institution to reinstate a counteroffer that the applicant previously did not accept (or asks the institution to reconsider an application that was denied, withdrawn, or closed for incompleteness), the institution may treat that request as the continuation of the earlier transaction or as a new transaction. If the institution treats the request for reinstatement or reconsideration as a new transaction,
it reports the date of the request as the application date.
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The opinions expressed are mine and they are not to be taken as legal advice.