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CHANGES IN ACCOUNTING POLICIES AND DISCLOSURES (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2019
Dec. 31, 2018
CHANGES IN ACCOUNTING POLICIES AND DISCLOSURES        
Weighted average lessee's incremental borrowing rate applied to the lease liabilities     5.75%  
Operating lease commitments disclosed as at December 31, 2018       ¥ 19,695
Discounted using weighted average incremental borrowing rate of 5.75%     ¥ 15,496  
Lease liabilities ¥ 46,729 ¥ 60,159 19,380  
Right-of-use assets     17,266  
Lease liability ¥ (13,404) ¥ (13,431) (19,380)  
Retained earnings     ¥ 2,114