A year after Iran signed a landmark nuclear accord, a key measure of whether it will succeed — a procedure to monitor Iranian procurement of nuclear and so-called dual-use materials and services — has yet to be seriously tested.

Mark Hibbs, a senior associate in the Nuclear Policy Program of the Carnegie Endowment for International Peace, told Al-Monitor that a company seeking to transfer to Iran a sensitive item for display at a trade fair had submitted an application to the Procurement Working Group earlier this year. However, the application was withdrawn, he said, because it could not be processed in time for the exhibition. Hibbs did not identify the item.

The working group also conducted a trial run late last year before the nuclear agreement went into full implementation on Jan. 16, Hibbs said.

Asked for comment, an Obama administration official told Al-Monitor on condition of anonymity, "The working group has been putting processes in place to help ensure that the channel will work effectively. We are confident that it will, but can always make changes as needed once proposals start to come in."