Hi,
These constants are meant to simplify your task. Because they use symbolic names rather then internal value, you should be able to deduce from their name, wich one to use.
Admittedly, in this case names and values are identical - but you get the Intention.
In your example, you used cl_dd_area=>heading, for Parameter sap_style, meaning that you want your text to appear formatted as header.
If you have an idea (and usually you will), what your text is supposed to look like, by browsing the available constant-attributes of class cl_dd_area, you should be able to decide, which ones to use.
Best regards - Jörg
