How do I correct e@syFile™ Employer error: "Income Tax Reference Number (3100) is mandatory"?

How do I correct e@syFile™ Employer error: "Income Tax Reference Number (3100) is mandatory"?

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This error indicates that the employee's tax reference number is either missing or incorrectly entered.

To clear this error, confirm that the Tax Reference Number is entered correctly according to the document/proof provided by the employee.

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