159.This section provides that, where a claim for relief for overpaid tax is made, and the grounds for that claim are also grounds for Revenue Scotland to make an assessment on the claimant in respect of the tax, then Revenue Scotland can disregard certain restrictions on its ability to make an assessment. These include disregarding the expiry of a time limit. It also provides that a claim for relief for overpayment is not finally determined until the amount to which it relates is final (e.g. following the result of a review or appeal).