No. Unless a new account or entity identifier is assigned to a client or customer, each Firm Designated ID (FDID) must be unique, persistent and consistent for each trading account within the firm and across all vendors and systems the Industry Member may use to report Transaction Order events requiring an FDID to CAT and associated Customer and Account information for the FDID to CAT CAIS, and unique across time (with limited exceptions as noted in FAQ M16).