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TRADE AND OTHER RECEIVABLES - Movement in allowance for expected credit losses (Details) - Trade receivables - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movement in the allowance for expected credit losses    
Opening balance $ 6,298,208 $ 6,494,113
Increase (decrease) 1,762,246 1,629,761
Provision reversal (1,184,953) (1,257,591)
Increases (decrease) for changes of foreign currency (382,514) (568,075)
Sub - total movements 194,779 (195,905)
Ending balance $ 6,492,987 $ 6,298,208