Bug 153506 Strange error message when group key refers to bad binding column name
Run attached report design. The following error is shown: Group key "groupkey" in group 1 cannot depend on column bindings defined in the group lower than itself. This is a strange error. Since the actual problem is that the table's binding column "groupkey" is defined to refer to another existing binding: row["bad"]. EXPECTED BEHAVIOR: The error message should clearly indicate that a non-existing binding is the cause of the failure.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ExprManagerUtil.java
String getValue( )
		{
			return this.value;
		}
		/**
		 * @param n
		 */
		void addChild( Node n )
		{
			this.children.add( n );
		}
		/** 
		 * @return
		 */
		List getChildren( )
		{
			return this.children;
		}
		/*
		 * @see java.lang.Object#equals(java.lang.Object)
		 */
		public boolean equals( Object o )
		{
			if ( ( o instanceof Node ) && ( (Node) o ).value.equals( this.value ) )
				return true;
			return false;
		}		
	}
	
}