5 C.F.R. § 845.306
Waiver precluded
Waiver of an overpayment cannot be granted when—
(a) The overpayment was obtained by fraud; or
(b) The overpayment was made to an estate.
Waiver of an overpayment cannot be granted when—
(a) The overpayment was obtained by fraud; or
(b) The overpayment was made to an estate.