Some magnitudes only accept SIunits in some solution integrals. Per example temperature in Surface integral or Volume integral and Heat flux in Volume integral. In volume and surface means that doesn't happen.
This happens because the combined unit sometimes has unusual dimensions that it doesn't have units for (temperature * length^3 or length^2) so it just puts that placeholder instead. I'll add units for those three cases but there could be others that still won't have their own unit.
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