In order to calculate the amount of tax correctly it is important to ensure that the correct provisional tax payments are included in the calculation. Where it says tax credits click on the three dots to the right of that to open up the provisional tax payment screen. It should be noted that if you are using provisional tax calculations and submissions that you can pull down the amounts of provisional tax paid.
The provisional tax payments can be downloaded from the receipts file if you retrieve the receipts or if you enter the receipts manually. The various screens are shown below.