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Trade Accounts Payable
 12 Months Ended
Dec. 31, 2018
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Trade Accounts Payable
21

TRADE ACCOUNTS PAYABLE

As of December 31, this item includes:

 

     2017      2018  

Invoices payable

      1,250,586        591,619  

Unbilled services received

      132,514        378,670  

Notes payable

      69,946        109,242  
  

 

 

     

 

 

  
     1,453,046        1,079,531  
  

 

 

     

 

 

  

The balance of services received but not billed includes the estimate made by management corresponding to the valuation by the degree of completion, which amounted to S/378.7 million at December 31, 2018 (S/132.5 million at December 31, 2017).