fix: incorrect landed cost voucher amount

[rohitwaghchaure]

• Create two purchase receipts, one will have 2 items and another one has single item.
• Create landed cost voucher and pull both above purchase receipts
• Pull all 3 items
• Set "Distribute Charges Based On" as "Distribute Manually"
• Add Applicable Charges with amount as 600
• Set the Applicable Charges as 100, 100, 200 to all 3 items respectively.
• Try to submit the landed cost voucher

You will get the below error

Solution

1. If the "Distribute Charges Based On" set as "Distribute Manually" then don't allow user to add multiple Applicable Charges
2. Don't Distribute Charges if the "Distribute Manually" option has set.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (ebc8230) 60.09% compared to head (d78a1e7) 60.13%.
Report is 173 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #39684      +/-   ##
===========================================
+ Coverage    60.09%   60.13%   +0.04%     
===========================================
  Files          757      758       +1     
  Lines        70434    70965     +531     
===========================================
+ Hits         42325    42673     +348     
- Misses       28109    28292     +183     

Files	Coverage Δ
...stock/doctype/purchase_receipt/purchase_receipt.py	73.03% <100.00%> (+0.21%)	⬆️
...doctype/landed_cost_voucher/landed_cost_voucher.py	80.00% <50.00%> (-0.40%)	⬇️
...tax_withholding_details/tax_withholding_details.py	81.14% <90.00%> (ø)

... and 47 files with indirect coverage changes