Do you Create a SF 1449 from the Original Base IDIQ or off the Last Modification?
A task order is created from the original base indefinite delivery-indefinite quantity contract. The previous modification is a situational change to the base contract, and does not carry any authority to support issuing a task order.
You can also issue a task order using a DD 1155. See DFARS PGI 253.213-70 for directions. And, see FAR subpart 16.5 for more guidance on IDIQ contracts.