Final answer:
The Comptroller General must grant relief in situations where it involves fulfilling constitutional duties, ensuring legal compliance with appropriations, and managing reports of urgent financial concerns under federal statutes.
Step-by-step explanation:
The Comptroller General must grant relief under specific circumstances when managing the financial oversight and legal obligations of a state. According to the information provided, the Comptroller has constitutional duties that include submitting revenue estimates to the governor and legislature, as well as certifying that any appropriations bill passed falls within available revenues before it heads to the Governor. In legal cases, such as Flast v. Cohen, it has been established that taxpayers have the right to sue to prevent the misuse of federal funds, which indirectly outlines a situation where the Comptroller's intervention may be necessary to ensure compliance with constitutional limitations.
Furthermore, under 50 U.S.C. § 3033(k)(5)(A), an employee within the intelligence community is allowed to report to Congress a complaint of urgent concern, and this could also implicate the Comptroller's office if it pertains to financial matters. Overall, the circumstances requiring the Comptroller's relief include those related to constitutional obligations, legal adherence, and potential whistleblowing situations involving financial concerns.