Switch FN support inside Rules

[kddejong]

Issue #, if available:
fix #3711
Description of changes:

• Switch FN support inside Rules

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.70%. Comparing base (c944440) to head (d3f349c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3712      +/-   ##
==========================================
- Coverage   93.70%   93.70%   -0.01%     
==========================================
  Files         362      362              
  Lines       12333    12345      +12     
  Branches     2632     2635       +3     
==========================================
+ Hits        11557    11568      +11     
  Misses        429      429              
- Partials      347      348       +1     

Flag	Coverage Δ
unittests	93.64% <100.00%> (-0.01%)	⬇️

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