Add note to invalid rule

examples/oml/SystemDesignOntology2Layers/src/oml/ua.be/sdo2l/vocabulary/base/tabular.oml

@@ -29,7 +29,7 @@ vocabulary <http://ua.be/sdo2l/vocabulary/base/tabular#> as tabular {
     	functional
     ]
     
-    
+    // TODO This is not a valid rule and will be ignored by the reasoner
     @rdfs:comment "Infers that when the type of the column is numeric it may have a unit"
 	rule NumericTypeInfersUnit [
 		hasBasicType(c, t) ^ base:BasicType(t) -> hasUnit(c, u)