Use a dated revised assignment letter and current project or contract records that explain scope, deliverables, location, supervision and anticipated dates. Retain a clear account of the differences from the original evidence.
Keep the file internally consistent
Check that manager letters, client confirmations and duty descriptions reflect the same current work. If commercial documents remain unsigned or conditional, describe that status accurately. The objective is evidence of a real qualifying assignment, not simply a fresh date on an old narrative.
Have the changes reviewed for any required petition action. Replace the outdated material rather than adding to it, and keep the file internally consistent, since a set containing both the superseded plan and its replacement invites questions about which describes the intention. Obtain the current project documentation: the revised scope or statement of work, the updated schedule, the current resourcing plan, and whatever internal approval records the change.
Where a client is involved, the current contract position matters as much as the internal plan. Retain the earlier version separately with a note of when and why it was superseded, since the history may need explaining and a document that simply disappeared is worse than one that was replaced for a stated reason. Check that every document in the file describes the same assignment before any of it is submitted.