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TRADE RECEIVABLES (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
TRADE RECEIVABLES      
Trade receivables   ¥ 672,533 ¥ 650,963
Less: provision for bad debt allowance ¥ (71,565)    
Current trade receivables   ¥ 177,023 ¥ 224,114