Substitution of petitioner requires the substituted creditor or partner to amend the petition and file supporting affidavit within seven days. Where a Member orders substitution of a creditor or partner as petitioner, the hearing is adjourned and amendments directed; the substituted creditor or partner must, within seven days, amend the petition, file two clean copies and an affidavit in duplicate setting out the supporting grounds. The amended petition is treated as the petition for winding up and is deemed presented on the original petition's presentation date.