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6. TRADE RECEIVABLES (Tables) | 12 Months Ended
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Dec. 31, 2018
Trade Receivables Tables Abstract |
Trade receivables |
|  |  | Consolidated
| 12/31/2018 |  | 12/31/2017
Trade receivables |  |  |
Third parties |  |  |
Domestic market | 1,369,396 |  | 1,290,823
Foreign market | 852,821 |  | 982,846
| 2,222,217 |  | 2,273,669
Allowance for doubtful debts | (237,352) |  | (191,979)
| 1,984,865 |  | 2,081,690
Related Parties (note 19 b) | 93,317 |  | 115,388
| 2,078,182 |  | 2,197,078
Gross trade receivables from third parties |
|  |  |  | Consolidated
|  | 12/31/2018 |  | 12/31/2017
Current |  | 1,514,847 |  | 1,391,839
Past-due up to 30 days |  | 177,287 |  | 167,760
Past-due up to 180 days |  | 47,684 |  | 142,346
Past-due over 180 days |  | 482,399 |  | 571,724
|  | 2,222,217 |  | 2,273,669
Changes in allowance for doubtful debts |
|  | Consolidated
|  | 12/31/2018 |  | 12/31/2017
Opening balance |  | (191,979) |  | (172,782)
Expected credit losses |  | (53,706) |  | (36,697)
Recovery of receivables |  | 8,333 |  | 17,500
Closing balance |  | (237,352) |  | (191,979)

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