Machine revaluation

Revaluation account goes through equity and any reversal can be treated in profit or loss or oci. Eg property valuation if there is no revaluation surplus to offset current years loss, it must be recognised in oci. Like that gains or losses can be treated through oci. Last year revalution surplus was 5k and tgis years downward eevalution is 10k. The oci will carry the loss to reserve anx we must also debit 10-5k as an expense in profit and loss . 

Forgot to mention your presentation of statments will have what items will first be recognised into profit or loss and oci. Next whenever you offset and current years gain or loss with previous years revaluation surplus or deficit, the balance can be taken to profit or loss. 

Yes. Revaluation of property plant and equipment goes through the reserves. But not through p&l. This item cannot be reclassified into P&l. Like this there are list of items presented 

No still the same procedure.