Attaché Payroll (Australia): error message: "tax Scale WHM - Working Holiday Maker can only be used with Tax Cert Category H - Working Holiday Maker. Please update tax scale"

This error occurs as the Tax Cert Category field in the Employee Masterfile, Tax tab has not been set to H - Working Holiday Maker. Set the value to this and the error will not then display.
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In addition, in the same tab, make sure the Residency Status field is set to N = Non - Resident, and the employees home country is entered in the Home Country field.