R.I. Gen. Laws § 33-11-7: Affidavit to support claim.

If requested by the personal representative or any party interested in decedent’s estate, a claimant shall file in the office of the clerk of the probate court a sworn affidavit stating to the best of the claimant’s knowledge and belief: (a) the legal basis or theory of the claim; (b) the facts and documentation supporting the claim; (c) the calculation of the amount claimed as justly due; (d) whether the estate was credited for all payments and offsets to which it is entitled; (e) whether and how the claim is secured; and (f) whether the claim is upon a negotiable instrument.