Adjudicator’s Field Manual Chapter 22.2(d) – Priority Dates
(d) Priority Dates .
...
(1) Determining the Priority Date .
In general, if a petition is supported by an individual labor certification
issued by DOL, the priority date is the earliest date upon which the labor
certification application was filed with DOL. In those cases where the alien
’s priority date is established by the filing of the labor certification,
once the alien’s Form I-140 petition has been approved, the alien
beneficiary retains his or her priority date as established by the filing of
the labor certification for any future Form I-140 petitions, unless the
previously approved Form I-140 petition has been revoked because of fraud or
willful misrepresentation. This includes cases where a change of employer
has occurred; however, the new employer must obtain a new labor
certification if the classification requested requires a labor certification
(see the section on successor in interest).
请注意“alien beneficiary retains his or her priority date”，“unless the
previously approved Form I-140 petition has been revoked because of fraud or
willful misrepresentation.”
所以withdraw情况下，PD是可以保留的。
