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6. TRADE RECEIVABLES (Tables)
 12 Months Ended
Dec. 31, 2020
Trade and other receivables [abstract]  
Schedule of trade receivables
       Consolidated
  12/31/2020   12/31/2019
Trade receivables      
Third parties      
Domestic market 910,657   1,118,632
Foreign market 2,063,867   1,003,905
  2,974,524   2,122,537
Allowance for doubtful debts  (228,348)    (245,194)
  2,746,176   1,877,343
Related parties (note 22 b) 121,176   170,588
  2,867,352   2,047,931
Schedule of gross trade receivables from third parties

The composition of the gross balance of accounts receivable from third party customers is shown as follows:

 

      Consolidated
  12/31/2020   12/31/2019
Current 2,537,567   1,739,746
Past-due up to 30 days 222,972   132,845
Past-due up to 180 days   17,915     23,877
Past-due over 180 days 196,070   226,069
  2,974,524   2,122,537
Schedule of allowance for doubtful debts

The changes in credit losses are as follows:

 

        Consolidated
    12/31/2020   12/31/2019
Opening balance    (245,194)    (237,352)
(Loss)/Reversal estimated    7,513   (43,313)
Recovery and write-offs of receivables     9,333   35,471
Closing balance    (228,348)    (245,194)