fix: join condition for invoices with multiple taxes and charges

[dvdl16]

Description

• fix: join condition for invoices with multiple taxes and charges

Type of change

• 🟢 Bug fix (change which fixes an issue)
• ⚪ New feature (change which adds functionality)
• ⚪ Breaking change (fix or feature that would cause existing functionality to not work as expected)

Tests

• Unit Tests have been updated or added, as required
• UI Tests have been updated or added, as required

Checklist:

• My code follows Naming Guidelines (DocType, Field and Variable naming)
• No Form changes / My code follows the Form Design Guidelines
• My code follows the Coding Standards of this project
• My code follows the Code Security Guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas / No comments necessary
• I have made corresponding additions/changes to the documentation
• All business logic and validations are on the server-side / No business logic or validation changes
• No patches are necessary / Migration Patches have been added to the correct subdirectory of /patches and patches.txt have been updated

User Experience:

N/A

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 40.38%. Comparing base (8ccf63f) to head (ee0a9b5).

Files with missing lines	Patch %	Lines
csf_za/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           version-15      #25   +/-   ##
===========================================
  Coverage       40.38%   40.38%           
===========================================
  Files              10       10           
  Lines             463      463           
===========================================
  Hits              187      187           
  Misses            276      276           

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