fix: over billing validation

[nextchamp-saqib]

Steps to replicate the issue:

• Create a Delivery Note with an item with qty as 1
• Create a Sales Invoice against it and duplicate the item
• Submit the Sales Invoice

The Sales Invoice is submitted with double the qty as in Delivery Note, basically bypassing over-billing validation
This happens because over-billing validation only considers Sales Invoice Items from other submitted invoices, it doesn't consider items from itself that is being submitted.

[codecov]

Codecov Report

Merging #28218 (86909c5) into develop (c8d0d9e) will increase coverage by 2.64%.
The diff coverage is 77.77%.

@@             Coverage Diff             @@
##           develop   #28218      +/-   ##
===========================================
+ Coverage    55.24%   57.89%   +2.64%     
===========================================
  Files         1255     1250       -5     
  Lines        67935    93176   +25241     
===========================================
+ Hits         37534    53941   +16407     
- Misses       30401    39235    +8834     

Impacted Files	Coverage Δ
erpnext/controllers/accounts_controller.py	87.83% <77.77%> (+4.27%)	⬆️
...work_order_stock_report/work_order_stock_report.py	86.27% <0.00%> (-13.73%)	⬇️
erpnext/utilities/product.py	41.34% <0.00%> (-9.38%)	⬇️
...tch_item_expiry_status/batch_item_expiry_status.py	86.25% <0.00%> (-8.09%)	⬇️
erpnext/portal/doctype/homepage/homepage.py	68.18% <0.00%> (-5.16%)	⬇️
erpnext/shopping_cart/product_info.py	48.00% <0.00%> (-4.95%)	⬇️
...ext/loan_management/doctype/loan_type/loan_type.py	80.95% <0.00%> (-4.77%)	⬇️
...e/sanctioned_loan_amount/sanctioned_loan_amount.py	84.61% <0.00%> (-4.28%)	⬇️
...t/education/doctype/academic_year/academic_year.py	83.33% <0.00%> (-4.17%)	⬇️
...cturing/doctype/work_order_item/work_order_item.py	81.81% <0.00%> (-3.90%)	⬇️
... and 1048 more

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed within a week if no further activity occurs, but it only takes a comment to keep a contribution alive :) Also, even if it is closed, you can always reopen the PR when you're ready. Thank you for contributing.

[nextchamp-saqib]

@Mergifyio backport version-13-hotfix

[mergify]

backport version-13-hotfix

✅ Backports have been created

• #28573 fix: over billing validation (backport #28218) has been created for branch version-13-hotfix