Article 10 General accounting requirements
The amount of any item shown shall be determined on a prudent basis, and in particular–
(a)
only surpluses realised at the balance sheet date shall be included in the income and expenditure account; and
(b)
all liabilities and deficits which have arisen or are likely to arise in respect of the period of account to which the accounts relate shall be taken into account, including those which only become apparent between the balance sheet date and the date on which it is signed on behalf of the board.