An officer of the Board may amend a partnership return so as to correct—
obvious errors or omissions in the return (whether errors of principle, arithmetical mistakes or otherwise), and
anything else in the return that the officer has reason to believe is incorrect in the light of information available to the officer.
A correction under this section is made by notice to the partner who made and delivered the return, or his successor.
No such correction may be made more than nine months after—
the day on which the return was delivered, or
if the correction is required in consequence of an amendment of the return under section 12ABA of this Act, the day on which that amendment was made.
A correction under this section is of no effect if the person to whom the notice of correction was given, or his successor, gives notice rejecting the correction.
Notice of rejection under subsection (4) above must be given—
to the officer of the Board by whom the notice of correction was given,
before the end of the period of 30 days beginning with the date of issue of the notice of correction.