Normally you want "the_excerpt()" to appear in the "excerpt" view (e.g., View Listings) and "the_content()" to appear in the "single" view (e.g., View Listing). As WPBDP is currently coded, the "single" view includes both "the_excerpt()" and "the_content()".
From a business perspective there are potentially other items when you may wish to display a short code in the "excerpt" view and more detail in the "single" view. Perhaps an note or icon in the "excerpt" view to indicate that the "single" view includes a detailed map, video, more photos, etc.
For each form field, you may want the option to specify if the field is to be displayed in the "excerpt only", "single only", or "both". Ideally, you may also want the option to display the "excerpt" fields in a different order than the "single" fields.
I think WPBDP does provide a way to display individual form fields so all of this can already be accomplished through more complex templates. However, I am not sure if the info on http://businessdirectoryplugin.com/docs/matching-the-design-to-your-theme/ is up to date since it refers to "wpbusdirman" functions which I believe have been deprecated.