Once you accept or decline a request, that outcome is fixed. You cannot switch it later, and neither can the other parent. The same applies to the moment you acknowledge a request — that timestamp is set once and never moves.
Why
The value of a shared record is that neither parent can revise it after the fact. If a decision could be changed later, then nothing in the log would mean very much: a run of acceptances might have been declines last week, and there would be no way for anyone reading it — including a solicitor or a court — to know.
Making outcomes permanent is what allows the record to be relied on. It protects you as much as the other parent, because it means your decisions can't be re-characterised either.
Because of that, we make you confirm
Accepting and declining both ask you to confirm before anything is recorded. That extra step exists precisely because the result is permanent — it prevents an accidental tap becoming a fixed part of the record.
Acknowledging is a single click, because it only records that you have seen the request. It is not a decision and commits you to nothing.
If circumstances change
Send a new request. The original stays in the record as what was decided at the time, and the new one records what you have since agreed. Both parents can see the full sequence, which is a more accurate account of what happened than a single entry that quietly changed.
This is also why declining with “Would like to discuss this first” still counts as a decline. It records honestly that this particular request wasn't agreed, and once you have talked it through, whoever is proposing the new plan sends a fresh request for it.