Most companies assume that if you're in a position which doesn't take advantage of all your qualifications and are being paid accordingly then you'll happily move to a position which does take advantage of more of your qualifications and comes with better pay at a later date.

If this assumption is incorrect, and the employee wishes to be undervalued and underutilised even when a need arises for previously unused talent and skills, then the employer should be made aware of those feelings.