TRADE RECEIVABLES - Additional Information (Details) - CNY (¥)	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of TRADE RECEIVABLES [Line Items]
Allowance of doubtful accounts on trade receivables	¥ 645,777,000	¥ 495,510,000
Expected credit loss rate	15.00%	13.00%
Five Largest Customers [Member]
Disclosure Of TRADE RECEIVABLES [Line Items]
Expected credit loss rate	45.00%	42.00%

The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Name:	ifrs-full_ExpectedCreditLossRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant