In every action of assumpsit the plaintiff shall file with his declaration an account stating distinctly the several items of his claim, unless it be plainly described in the declaration, and if he fail to do so, he shall not be permitted on the trial of the case to prove any item not stated in such account.
W. Va. Code § 56-4-18
Filing account in assumpsit
Official source: West Virginia Legislature. Reproduced from public-domain West Virginia statutes; confirm against the official source for the current text. Not legal advice.