19 C.F.R. § 190.53
(a) General. CBP may require claimants to restructure their drawback claims in such a manner as to foster administrative efficiency. In making this determination, CBP will consider the following factors:
(b) Exemption from restructuring; criteria. In order to be exempt from a restructuring, a claimant must demonstrate an inability or impracticability in restructuring its claims as required by CBP and must provide a mutually acceptable alternative. Criteria used in such determination will include a demonstration by the claimant of one or more of the following: