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Trade receivables - Additional informations (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Trade receivables    
Total trade receivables ¥ 998,036 ¥ 934,152
Up to 1 year    
Trade receivables    
Total trade receivables 932,479 897,114
1 to 2 years    
Trade receivables    
Total trade receivables 42,752 22,920
2 to 3 years    
Trade receivables    
Total trade receivables 13,857 8,026
Above 3 years    
Trade receivables    
Total trade receivables ¥ 8,948 ¥ 6,092