This page identifies a possible issue, inconsistency, concern, error, or bug!
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The issue arises probably because of the legacy of SysMLv1.x extending UML2.5.x. Because SysMLv1.x (unlike Mathematica) does not offer a fully Units-aware Quantity algebra, it does not take into consideration that each "variable" (value property) may carry its own units. Tacking on the Unit display in this case in fact leads to dimensional errors!