A recent Armed Services Board of Contract Appeals decision provides useful guidance on when the government may (or may not) waive its defense that a contractor’s claim failed to state a sum certain. In GE Renewables US, LLC, the contractor had submitted a claim to the contracting officer for a determination that the contractor had the right to an economic price adjustment (EPA) due to an inflation-related price increase. Notably, the contractor did not provide the value of its requested adjustment in its claim. The contracting officer denied the claim, and the contractor appealed to the Board.