https://wiki.freecadweb.org/Add_FEM_Equation_Tutorial
At the end of Section: Elmer's Equation Object, it says:
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Finally one has to register a makeEquationStatcurrent definition in ObjectsFem.py by duplicating an available entry.
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Finally one has to register a makeEquationFlow definition in src/Mod/Fem/ObjectsFem.py by duplicating an available entry.
John