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chore: Add transfer bucket working to .md file

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marination 2022-02-15 20:30:16 +05:30
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erpnext/stock/report/stock_ageing/stock_ageing_fifo_logic.md
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@ -71,4 +71,39 @@ Date | Qty | Queue
2nd | -60 | [[-10, 1-12-2021]]
3rd | +5 | [[-5, 3-12-2021]]
4th | +10 | [[5, 4-12-2021]]
4th | +20 | [[5, 4-12-2021], [20, 4-12-2021]]
4th | +20 | [[5, 4-12-2021], [20, 4-12-2021]]
### Concept of Transfer Qty Bucket
In the case of **Repack**, Quantity that comes in, isn't really incoming. It is just new stock repurposed from old stock, due to incoming-outgoing of the same warehouse.
Here, stock is consumed from the FIFO Queue. It is then re-added back to the queue.
While adding stock back to the queue we need to know how much to add.
For this we need to keep track of how much was previously consumed.
Hence we use **Transfer Qty Bucket**.
While re-adding stock, we try to add buckets that were consumed earlier (date intact), to maintain correctness.
#### Case 1: Same Item-Warehouse in Repack
Eg:
-------------------------------------------------------------------------------------
Date | Qty | Voucher | FIFO Queue | Transfer Qty Buckets
-------------------------------------------------------------------------------------
1st | +500 | PR | [[500, 1-12-2021]] |
2nd | -50 | Repack | [[450, 1-12-2021]] | [[50, 1-12-2021]]
2nd | +50 | Repack | [[450, 1-12-2021], [50, 1-12-2021]] | []
- The balance at the end is restored back to 500
- However, the initial 500 qty bucket is now split into 450 and 50, with the same date
- The net effect is the same as that before the Repack
#### Case 2: Same Item-Warehouse in Repack with Split Consumption rows
Eg:
-------------------------------------------------------------------------------------
Date | Qty | Voucher | FIFO Queue | Transfer Qty Buckets
-------------------------------------------------------------------------------------
1st | +500 | PR | [[500, 1-12-2021]] |
2nd | -50 | Repack | [[450, 1-12-2021]] | [[50, 1-12-2021]]
2nd | -50 | Repack | [[400, 1-12-2021]] | [[50, 1-12-2021],
- | | | |[50, 1-12-2021]]
2nd | +100 | Repack | [[400, 1-12-2021], [50, 1-12-2021], | []
- | | | [50, 1-12-2021]] |