one to many mapping

[crdanielbusch]

Pull request

Re-opening #284 because I merged it into the wrong branch.

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Description in a {pr}.thing.md file in the directory changelog added - see changelog/README.md for details

Description

Please provide a short description what your pull request does.

[codecov]

Codecov Report

Attention: Patch coverage is 97.77778% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.66%. Comparing base (ae21fe8) to head (3da2728).
Report is 20 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
primap2/tests/test_convert.py	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
- Coverage   96.80%   96.66%   -0.14%     
==========================================
  Files          49       49              
  Lines        4598     4619      +21     
==========================================
+ Hits         4451     4465      +14     
- Misses        147      154       +7     

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