A useful plan will sometimes change. Trouble begins when the change happens silently and everyone reports against a different version of the agreement.
Preserve the original commitment before revising it. Record what changed, why and who needs to know. Keep enough history to understand the decision later without turning every adjustment into an administrative project.
Separate revision from reconstruction
Imagine a fictional team planning to finish a guide on Thursday. An essential reviewer becomes unavailable. Moving delivery to Monday and recording the dependency creates a visible revision. Replacing Thursday with Monday and claiming the work was always on time erases information the next plan could use.
For personal work, a moved session can be sensible. Repeatedly moving it without examining the cause prevents you from learning whether the commitment fits your life.
Carry the consequence forward
Tell affected people what the revision means. An earlier draft may be more useful than waiting for the full version. Another task may need to move. Offer those choices while there is time to make them.
At review, ask whether the original plan omitted something foreseeable. If it did, improve the method. If it did not, retain the lesson about responding well. A credible history lets you distinguish between those cases. A perfectly rewritten history makes them look the same.