(a) If there are insufficient assets to pay all claims of the same class, other than secured claims for money, the claims in that class shall be paid pro rata, as directed by the court, and in the order directed.
(b) A personal representative may not be allowed to pay a claim under Subsection (a) other than with the pro rata amount of the estate funds that have come into the representative's possession, regardless of whether the estate is solvent or insolvent.