(17) Trade and other receivables

Trade and other receivables form part of the financial assets (see accounting policy 13a). Trade and other receivables are carried at amortised cost less a provision for expected credit losses. In measuring the amount of the provision for expected credit losses, use is made of the simplified approach involving consistent recognition of an allowance at an amount equal to lifetime expected credit losses. Amounts still to be invoiced relating to concluded projects are recognised under trade and other receivables.