13. Trade and other receivables
 
Figures in Rand thousand   2019    Restated*
2018  		    
Financial instruments     2 304 768     3 629 433       
Trade receivables     2 268 177     3 543 616       
   Gross trade receivables     2 734 409     4 141 616       
   Provision for credit notes     (24 013)    (24 020)      
   Impairment allowance (refer to note 44)    (442 219)    (573 980)      
Other receivables     36 591     85 817       
Non-financial instruments     859 382     1 103 872       
Net contract assets     644 937     799 768       
   Gross contract assets     738 773     837 302       
   Provision for contract assets     (93 836)    (37 534)      
Prepayments     93 587     237 396       
VAT receivable     80 434     10 742       
Other receivables     40 424     55 966       
    3 164 150    4 733 305     

Trade and other receivables of at least 80% are required to be pledged and ceded for the purposes of loan security in terms of the security arrangements through the Security SPV for the interest-bearing liabilities contained in note 21 and referred to as ‘loans secured through Security SPV.’

* Refer to note 2.1 for the transition impact of IFRS 9 on the finance lease receivables and the financial instruments (trade receivables, contract assets and other receivables) and refer to note 3 for further information regarding the prior year restatement.

Contract assets were previously disclosed as work in progress.