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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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
INCOME TAX      
Loss before taxation ¥ 89,841 ¥ 193,062 ¥ 9,445
Tax calculated at a tax rate of 25% (22,460) (48,266) (2,361)
Tax effect on non-deductible expenses 0    
Tax effect on different tax rates of group entities operating in other jurisdictions 5,163 1,607 842
Inventory provision (reversal) that are not tax deductible (taxable) (24,809) (575) (14,192)
Bad debt allowance that are not tax deductible 30,417 37,567 17,165
Depreciation and amortization adjustments that are not tax deductible (11,337) (14,757) (18,050)
Other 0   29
Lease charge under IFRS 16 (193) 282  
Net operating losses not recognized to deferred tax assets 23,436 24,175 16,623
Tax per financial statements ¥ 217 ¥ 33 ¥ 56