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RELATED PARTY BALANCES AND TRANSACTIONS - Schedule of transactions with related parties (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Purchase of merchandise from related parties | ¥ 92,115 | ¥ 205,275 | ¥ 367,342
Zhaomu |  |  |
Purchase of merchandise from related parties |  | 53,790 | 103,269
Bixin |  |  |
Purchase of merchandise from related parties | 7,637 | 31,825 | 69,311
Zhengdao |  |  |
Purchase of merchandise from related parties |  | 28,372 | 31,418
Yunnong |  |  |
Purchase of merchandise from related parties | 4,301 | 21,453 | 8,006
Tianshi |  |  |
Purchase of merchandise from related parties | 11,256 | 17,021 | 25,295
Haomei |  |  |
Purchase of merchandise from related parties |  | 16,404 | 13,443
Weixin |  |  |
Purchase of merchandise from related parties | 14,508 | 9,214 | 79,309
Siwei |  |  |
Purchase of merchandise from related parties | 2,441 | 7,710 | 5,626
Yunmu |  |  |
Purchase of merchandise from related parties |  | 4,543 |
Misili |  |  |
Purchase of merchandise from related parties | 1,091 | 3,315 | 8,230
Huaji |  |  |
Purchase of merchandise from related parties | 4,265 | 2,573 | 0
Yuncheng |  |  |
Purchase of merchandise from related parties | 13,147 | 2,239 |
JiAo |  |  |
Purchase of merchandise from related parties |  | 1,712 |
Yunding |  |  |
Purchase of merchandise from related parties | 869 | 1,652 |
Langfei |  |  |
Purchase of merchandise from related parties |  | 1,117 | 3,507
Xingsheng |  |  |
Purchase of merchandise from related parties | 11,768 | 600 |
Zhangtaihe |  |  |
Purchase of merchandise from related parties |  | 482 | 16,400
Small Ye Group |  |  |
Purchase of merchandise from related parties |  | 307 | 3,097
Liumang Yike |  |  |
Purchase of merchandise from related parties | 1,498 |  |
Jimi |  |  |
Purchase of merchandise from related parties | 17,519 |  |
Poyun |  |  |
Purchase of merchandise from related parties | 801 |  |
Others |  |  |
Purchase of merchandise from related parties | ¥ 1,014 | ¥ 946 | ¥ 431

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