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Trade receivables (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Trade receivables    
Trade receivables ¥ 940,989 ¥ 891,174
Gross carrying amount    
Trade receivables    
Trade receivables 998,036 934,152
Impairment loss allowance    
Trade receivables    
Trade receivables ¥ (57,047) ¥ (42,978)