We are a sub to a prime under a IDIQ prime. We were proposed as a sub. on a delivery order by the prime. We proposed T&M rates. We are working under a letter subcontract and are about sign the IDIQ sub and task order once the sub package is finalized. The prime is insisting on us completing a certificate of current cost and pricing data. Our Pricing manager is insisting we don't need to sign a certificate for a T&M task order. Who is correct?