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13. Trade receivables (Details 1) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Trade Receivables    
Allowance for the impairment of trade receivables, beginning $ 1,385,861 $ 1,041,836
Change of accounting standard (Note 6) - adjustment by model of expected losses IFRS 9 0 126,155
Allowance for the impairment of trade receivables, beginning 1,385,861 1,167,991
Increase 1,365,186 1,419,571
Decrease (771,139) (598,437)
Result from exposure to inflation (433,618) (603,264)
Allowance for the impairment of trade receivables, ending $ 1,546,290 $ 1,385,861