(a) An application may be amended prior to the filing of answers thereto, or, if no answer is filed, prior to the issuance of an order establishing further procedures, disposing of the application, or setting the case for hearing. Thereafter, applications may be amended only if leave is granted pursuant to the procedures set forth in § 302.11.

(b) Except as otherwise provided, if properly amended, a document and any statutory deadline shall be made effective as of the date of original filing but the time prescribed for the filing of an answer or any further responsive document directed towards the amended document shall be computed from the date of the filing of the amendment.