The Request for amendment labels for earn‑out arrangements are only applicable when amending a prior‑year amount through an original return.
These labels are not available when lodging an amended return. If a change is required, the amendment must be made by revising the original return. Where this is not possible, an amended return must be created for the affected income year.
Further information can be found on the ATO's website: https://www.ato.gov.au/forms-and-instructions/capital-gains-tax-guide-2021/part-c-instructions-for-companies-trusts-and-funds-entities/step-4-how-to-complete-the-cgt-schedule