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TRADE RECEIVABLES - Additional Information (Details) - CNY (¥) | Dec. 31, 2020 | Dec. 31, 2019
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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%

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph IG20D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |