To resolve this issue, either:
Enter a positive amount in the ETP Taxable Component field, or
Delete the ETP worksheet if it is not required.
This validation is based on an ATO specification, which requires that a positive ETP taxable component amount be provided. If the Employment Termination Payment (ETP) contains only an ETP tax-free component, it should not be included in the tax return lodgement.
If you require further clarification regarding this requirement, please refer to the ATO's guidance on ETP reporting.