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Trade Accounts Receivables, Net

12 Months Ended

Dec. 31, 2019

10	TRADE ACCOUNTS RECEIVABLES, NET

At December 31, this account comprises:


	Total						Current						Non-current
	2018			2019			2018			2019			2018		2019
Receivables (a)		1,376,517			923,316			827,611			380,135			548,906		543,181
Unbilled receivables - Subsidiaries (b)		79,847			421,841			79,847			336,272			—		85,569
Unbilled receivables - Concessions (c)		584,174			234,688			113,013			110,236			471,161		124,452

		2,040,538			1,579,845			1,020,471			826,643			1,020,067		753,202
Impairment of account receivables		(12,643	)		(4,906	)		(12,643	)		(4,906	)		—		—

		2,027,895			1,574,939			1,007,828			821,737			1,020,067		753,202

The

non-current

portion of commercial receivables is mainly related to the financial asset model (Note 2.5) of the subsidiary GyM Ferrovias S.A. whose fair values of the

non-current

portion of commercial receivables amount to S/1,013 million (S/1,060 million as of December 31, 2018), these values are based on discounted cash flows using rates of 7.70% (7.33% as of December 31, 2018).

The ageing of the receivables net of impairment are detailed as follows:


	2018		2019
Current		890,100		802,341
Past due up to 30 days		259,062		28,216
Past due from 31 days up to 180 days		28,575		21,490
Past due from 181 days up to 360 days		152,732		28,327
Past due over 360 days		33,405		38,036

		1,363,874		918,410

b)	The unbilled receivables by subsidiaries are documents related to the estimates of the degree of progress for services rendered that were not billed, according detail:


	2018		2019
G Y M S.A.		14,455		384,660
Concar S.A.		38,770		10,737
GMI S.A.		26,622		24,787
GMP S.A.		—		1,657

		79,847		421,841

Below are the unbilled receivables by the subsidiaries grouped by the main projects:


	2018		2019
Infrastructure
Operation and maintenance of roads		38,066		9,837
Oil services		—		1,657
Others		703		901

		38,769		12,395

Engineering and Construction
Talara Refinery		—		190,831
North Concentrator Plant - Quellaveco		—		52,488
Oxide Plant - Marcobre		—		26,658
Civil works, assembly and electromechanics - Acero Arequipa		—		16,449
Project Mina Gold Fields La Cima S.A.		11,980		3,409
Generating Plant Machu Picchu		—		13,098
Others		29,098		106,513

		41,078		409,446

		79,847		421,841

The unbilled receivables – Concessions, corresponds to future collections for public services granted according

detail below:


	2018		2019
Linea 1 - Metro de Lima		558,179		208,205
Operation and maintenance of roads		25,397		25,315
Others		598		1,168

		584,174		234,688

In 2019, Management recognized in the period an impairment in trade accounts receivable for S/1 million (S/3.10 million in 2018). The maximum exposure to credit risk at the reporting date is the carrying amount of accounts receivable and work in progress (Note 11).