A trust company administering a common trust fund shall not:
If because of a creditor relationship or otherwise the trust company acquires an interest in a participation in such fund the participation shall be withdrawn on the first date on which such withdrawal can be effected. However, in no case shall an unsecured advance to an account holding a participation until the time of the next withdrawal be deemed to constitute the acquisition of an interest by the trust company.
N.Y. Comp. Codes R. & Regs. Tit. 3 § 22.19