Extra tax applicability rules are required for both the tax group and item tax group within the Tax Calculation service.

We can only use line amounts currently to determine tax groups but also require the order amount as a condition. We have to report to separate tax authorities depending on the total order value of the sale- this is for IOSS and OSS with the threshold set at £135 .

We have sales orders that contains order lines over and below this threshold so we will receive errors on the sales order due to two tax authorities being used. Ideally, the order would determine the tax group at the total order value as opposed to the line amount.