This section applies if a partnership return is amended under section 12ABA of this Act (amendment of partnership return by taxpayer), or a dispute about the return is referred to the tribunal under section 12ABZB(3) of this Act, at a time when an enquiry into the return is in progress in relation to any matter to which the amendment or dispute relates or which is affected by the amendment or dispute.
The amendment or dispute does not restrict the scope of the enquiry but may be taken into account (together with any matters arising) in the enquiry.
So far as the amendment affects any amount stated in the partnership statement included in the return, it does not take effect while the enquiry is in progress in relation to any matter to which the amendment relates or which is affected by the amendment and—
the amendment shall not take effect;
Where the effect of an amendment is deferred under subsection (3) above—
For the purposes of this section the period during which an enquiry is in progress in relation to any matter is the whole of the period—