In addition to the grounds set forth in §115.19, SBA may deny liability to a PSB Surety if:

(a) The PSB Surety's guaranteed bond was in an amount which, together with all other guaranteed bonds, exceeded the allotment for the period during which the bond was approved, and no prior SBA approval had been obtained;

(b) The PSB Surety's loss was incurred under a bond which was not listed on the bordereau for the period when it was approved; or

(c) The loss incurred by the PSB Surety is not attributable to the particular Contract for which an SBA guaranteed bond was approved.