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10. Financial instruments (Details 4) - ARS ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
SummaryOfFinancialInstrumentsLineItems [Line Items] |  |  |
Trade receivables |  | $ 7,587,906 | $ 8,385,237
Group 1 |  |  |
SummaryOfFinancialInstrumentsLineItems [Line Items] |  |  |
Trade receivables | [1] | 6,438,500 | 7,487,484
Group 2 |  |  |
SummaryOfFinancialInstrumentsLineItems [Line Items] |  |  |
Trade receivables | [2] | 480,237 | 339,740
Group 3 |  |  |
SummaryOfFinancialInstrumentsLineItems [Line Items] |  |  |
Trade receivables | [3] | $ 669,169 | $ 558,013
[1] | Relates to customers with debt to become due.
[2] | Relates to customers with past due debt from 0 to 3 months.
[3] | Relates to customers with past due debt from 3 to 12 months.

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- Definition The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_h&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
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