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TRADE RECEIVABLES (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
TRADE RECEIVABLES    
Trade receivables ¥ 822,747 ¥ 747,247
Less: provision for bad debt allowance (771,331) (645,777)
Current trade receivables ¥ 51,416 ¥ 101,470