Correcting the order date for tax calculation
If you are using the Tax Interface, tax amounts are calculated on sales orders based on the tax rates in effect at the time of entry. In the case of a tax rate change, a Correction (CR) order can be entered and linked to the effected invoice.
The invoice date from the previously invoiced order is sent to the Tax Interface so that the tax rates in effect on that date are applied to the CR line. If you do not specify an invoice number at the order or line level, the current date is passed to the Tax Interface, and the current tax rate is used. Use these instructions to correct the date used for a calculating the tax on an invoice.