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INCOME TAX EXPENSE/(CREDIT) - Reconciliation between income tax expense (credit) and (loss) profit before taxation at applicable tax rates (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
INCOME TAX EXPENSE CREDIT [Abstract] |  |  |
Loss before taxation | ¥ (193,062) | ¥ (9,445) | ¥ (418,465)
Tax calculated at a tax rate of 25% | (48,266) | (2,361) | (104,616)
Tax effect on non-deductible expenses | 0 |  |
Tax effect on different tax rates of group entities operating in other jurisdictions | 1,607 | 842 | 588
Impairment losses on property, plant and equipment, and investment property that are not tax deductible | 0 |  | 20,191
Impairment losses on land use right that are not tax deductible | 0 |  | 1,064
Inventory provision (reversal) that are not tax deductible (taxable) | (575) | (14,192) | 13,993
Bad debt allowance that are not tax deductible | 37,567 | 17,165 | 79,057
Depreciation and amortization adjustments that are not tax deductible | (14,757) | (18,050) | (15,890)
Other | 0 | 29 |
Lease charge under IFRS 16 | 282 |  |
Net operating losses not recognized to deferred tax assets | 24,175 | 16,623 | 5,822
Tax per financial statements | ¥ 33 | ¥ 56 | ¥ 209

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