See IG5317.7402 when contracting for long-lead items initiated with advance procurement funds. Follow DFARS 217.74 when contracting for long-lead items procured with other than advance procurement funds.
(d) If procurement funds must be added to an undefinitized long-lead procurement contract issued with advance procurement funds prior to definitization, the contract is subject to the requirements contained in DFARS 217.74, as supplemented. The definitization schedule requirements established in DFARS 217.7404-3 shall begin when the procurement funds are obligated on the undefinitized long-lead contract, and the limitations on obligations established in DFARS 217.7404-4 shall apply to the combination of the previously obligated advance procurement funds and the added procurement funds.