The date the injury occurred is used in several ways:
The date of injury is automatically seeded for the initial PI investigation from the liability claim. If it is incorrect, the delegate should ensure that it is corrected both in R&C ISH and in the Defcare system.
If the PI Assessment is being conducted concurrently with the liability assessment this field will remain blank until liability is accepted.
Links
[1] https://clik.dva.gov.au/user/login?destination=node/20821%23comment-form
[2] https://clik.dva.gov.au/military-compensation-srca-manuals-and-resources-library/permanent-impairment-handbook/ch-3-concepts