fix: Stock Ageing Transfer Bucket logic for Repack Entry with split batch rows

[marination]

Issue:

Consider Repack Entry with Same Item-Warehouse:

Item 1 > -50 > Batch 1
Item 1 > -50 > Batch 2
Item 1 > +100 > Batch 3
TLDR: Above ledger caused a balance difference of 50 in stock ageing

• Repack entries with split consumption rows (mostly due to batch) would generate inaccurate time bucket balances in FIFO queue for Stock Ageing
• For such an entry technically there's no material coming in. Just existing material repurposed.
• This is why we maintain transferred_item_details in FIFOSlots.
• We maintain qty that was consumed from the FIFO Queue via repack in transferred_item_details. Which is then re-added to the FIFO Queue and adjusted in transferred_item_details
• After consuming 50, 50 qty from the FIFO Queue, transferred_item_details looks like : [[50, date], [50, date]]
• Now for the 100 that is incoming we need to put it back in the FIFO Queue
• The older logic simply popped the first slot from transferred_item_details, thus making it : [[50, date]] and only adding 50 to the FIFO Queue
• The remaining 50, was left in transferred_item_details, which caused a difference of 50 in the generated FIFO Queue.

Fix:

• Consume transferred_item_details just like outgoing stock is consumed in the FIFO Queue (ref: __compute_outgoing_stock())
• So each bucket in transferred_item_details : [[50, date], [50, date]] is consumed given there's equivalent incoming stock
• If incoming stock is more than transfer bucket qty, excess incoming stock will be added as new slot in the FIFO Queue

To Test:

Consider Ledger below (note voucher nos):

• Before:
  

• After:
  

More Cases:

• Repack where Item 1 is consumed and Item 2 is produced. Check Stock Ageing for Item 2.
• Repack (negative stock) while having 0 stock, so outgoing SLE causes negative stock, and incoming makes stock 0 again. For same Item-Warehouse
• Repack: Overconsume. 26 consumed, 1 produced (more consumed, less produced)
• Repack: Overconsume with split rows (multiple rows), and produce less in one row
• Repack: Overproduce. Consumed 28, Produced 30
• Repack: Overproduce with split rows (multiple rows), and produce more in one row

You can check the test file and simulate similar ledgers if you want to

[marination]

[marination]

Unrelated test_item_search failing

[marination]

@Mergifyio backport version-13-hotfix

[marination]

@Mergifyio backport version-13-pre-release

[mergify]

backport version-13-hotfix

✅ Backports have been created

• #29876 fix: Stock Ageing Transfer Bucket logic for Repack Entry with split batch rows (backport #29816) has been created for branch version-13-hotfix

[mergify]

backport version-13-pre-release

✅ Backports have been created

• #29877 fix: Stock Ageing Transfer Bucket logic for Repack Entry with split batch rows (backport #29816) has been created for branch version-13-pre-release

[gavindsouza]

Great job on the tests + docs btw

[gavindsouza]

Breaks multi-tenancy!