Move rule that constants must have declaration equation

chapters/classes.tex

@@ -358,6 +358,10 @@ \subsection{Component Variability Prefixes discrete, parameter, constant}\label{
   not differentiable.
 \end{itemize}
 
+Components declared as \lstinline!constant! shall have an associated declaration equation with a constant expression, if the constant is directly in the simulation model, or used in the simulation model.
+The value of a constant can be modified after it has been given a value, unless the constant is declared \lstinline!final! or modified with a \lstinline!final! modifier.
+A constant without an associated declaration equation can be given one by using a modifier.
+
 If a \lstinline!Real! variable is declared with the prefix \lstinline!discrete!\indexinline{discrete} it must in a simulation model be assigned in a \lstinline!when!-clause, either by an assignment or an equation.
 The variable assigned in a \lstinline!when!-clause shall not be defined in a sub-component of \lstinline!model! or \lstinline!block! specialized class.
 (This is to keep the property of balanced models.)

chapters/operatorsandexpressions.tex

@@ -1436,8 +1436,6 @@ \subsection{Constant Expressions}\label{constant-expressions}
   \end{itemize}
 \end{itemize}
 
-Components declared as \lstinline!constant! shall have an associated declaration equation with a constant expression, if the constant is directly in the simulation model, or used in the simulation model.  The value of a constant can be modified after it has been given a value, unless the constant is declared \lstinline!final! or modified with a \lstinline!final! modifier.  A constant without an associated declaration equation can be given one by using a modifier.
-
 \subsection{Parameter Expressions}\label{parameter-expressions}
 
 Parameter expressions\index{parameter expression}\index{expression variability!parameter}\index{parametric variability|see{parameter expression}} are: