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Under IAS8, I understand that although the change in policy from cost model to revaluation model, the correction will be made prospectively.
But how about the case of the other way around from revaluation model to cost model, then we have to correct retrospectively as normal ?

yes, IAS 8.17

what are you reasons to plan such a change?

Thank you.
This is not a real example but hypothetical situation.
I suppose revaluation might suit to the investing buildings to reflect fair value of the market.
Then initially used revaluation model but practically more time consuming or value would not much changes.
So decided to use cost model which is more systematic and less time consuming.
This is an example.

Note that IAS8.17 specifically deals with a move TO revaluation, not back from it. Also it is generally considered that a move from revaluation to cost fails the test in IAS8.14(b) as it will never(?) provide more relevant information to users of the financial statements.

that's a great point exIFRS, we should remember that a change in accounting policy is allowed only if it 'results in the financial statements providing reliable and more
relevant information'