ADD: compliant check

[Segelzwerg]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.

Project coverage is 90.96%. Comparing base (f5005c4) to head (41b0a4b).
Report is 68 commits behind head on main.

Files with missing lines	Patch %	Lines
invoice/models.py	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #308      +/-   ##
==========================================
- Coverage   91.41%   90.96%   -0.45%     
==========================================
  Files          59       59              
  Lines        1397     1406       +9     
==========================================
+ Hits         1277     1279       +2     
- Misses        120      127       +7     

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