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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, 2020
Dec. 31, 2019
Movement in the allowance for expected credit losses    
Opening balance $ 6,492,987 $ 6,298,208
Increase (decrease) 2,321,958 1,762,246
Provision reversal (1,595,521) (1,184,953)
Increases (decrease) for changes of foreign currency (423,761) (382,514)
Sub - total movements 302,676 194,779
Ending balance $ 6,795,663 $ 6,492,987