No field to map against 'Exempt' in Xero integration

The reason why there is no option to map the 'Exempt' field to, during the Xero integration is because the Xero organisation does not have a tax rate of type 'Exempt Sales'.

Hence, a tax rate of type 'Exempt Sales' needs to be created in the Xero Organisation and it can then be mapped against the 'Exempt' field during the integration.