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PREPAID EXPENSES AND OTHER CURRENT ASSETS - Analysis of the allowance for doubtful debt in relation to other receivables (Details) - CNY (¥)
¥ in Thousands
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Analysis of the allowance for doubtful debt in relation to other receivables    
Balance at beginning of the year ¥ 445,669 ¥ 131,624
Addition 1,372 16,700
Write-off (467)  
Foreign exchange difference (33) 94
Balance at the end of the year ¥ 446,541 ¥ 148,418