fix: allow selection of stock entry from multiple subcontracting orders

[Ninad1306]

Issue Reference: #2661

_{Huly®: IC-2795}

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 61.35%. Comparing base (4bb9af2) to head (9a535d0).
Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../gst_india/overrides/subcontracting_transaction.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2671      +/-   ##
===========================================
+ Coverage    61.33%   61.35%   +0.01%     
===========================================
  Files          119      119              
  Lines        11505    11515      +10     
===========================================
+ Hits          7057     7065       +8     
- Misses        4448     4450       +2     

Files with missing lines	Coverage Δ
.../gst_india/overrides/subcontracting_transaction.py	79.47% <28.57%> (-0.53%)	⬇️

... and 3 files with indirect coverage changes