fix: local reference error in BOM

[niyazrazak]

Replicate Issue
1- Create Bom
2- Select Rate Of Materials Based On "Manual"
3- Save

[codecov]

Codecov Report

Merging #38850 (b50b3fb) into develop (39ef75e) will increase coverage by 0.01%.
Report is 60 commits behind head on develop.
The diff coverage is 83.10%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #38850      +/-   ##
===========================================
+ Coverage    60.18%   60.20%   +0.01%     
===========================================
  Files          759      759              
  Lines        69767    69772       +5     
===========================================
+ Hits         41992    42003      +11     
+ Misses       27775    27769       -6     

Files	Coverage Δ
erpnext/accounts/deferred_revenue.py	77.50% <100.00%> (ø)
...doctype/invoice_discounting/invoice_discounting.py	70.27% <ø> (ø)
...xt/accounts/doctype/payment_entry/payment_entry.py	84.15% <100.00%> (ø)
...ounts/doctype/purchase_invoice/purchase_invoice.py	70.12% <ø> (ø)
erpnext/accounts/general_ledger.py	90.67% <ø> (ø)
.../report/accounts_receivable/accounts_receivable.py	89.73% <100.00%> (+0.05%)	⬆️
...t/accounts/report/general_ledger/general_ledger.py	69.64% <100.00%> (ø)
...unts/report/purchase_register/purchase_register.py	86.33% <ø> (ø)
erpnext/accounts/utils.py	73.82% <100.00%> (ø)
erpnext/assets/doctype/asset/asset.py	73.43% <ø> (ø)
... and 22 more

... and 1 file with indirect coverage changes