Section 301.6223(f)-1 - Duplicate copy of final partnership administrative adjustment(a)In general. Section 6223(f) does not prohibit the Internal Revenue Service from issuing a duplicate copy of the notice of final partnership administrative adjustment (for example, in the event the original notice is lost).(b)Effective date. This section is applicable to partnership taxable years beginning on or after October 4, 2001. For years beginning prior to October 4, 2001, see § 301.6223(f)-1T contained in 26 CFR part 1, revised April 1, 2001.T.D. 8965, 66 FR 50550 , Oct. 4, 2001