The annual accounting date of Lawson plc is 31 May. The following matter needs to be dealt with before the financial statements for the year ended 31 May 2010 can be finalised. The company operates an open-cast mine and is legally obliged to restore the environment when mine workings are complete. This is expected to occur in the year 2021. The estimated cost of rectifying the environmental damage so far is EUR 6m. The estimated total cost of rectifying the damage caused until mine workings are complete is EUR 50m. 

Explain how this matter should be dealt with in the financial statements for the year ended 31 May 2010.