A vendor that does not carry a supply of goods sought by the UN on hand can be required to prove availability of a dependable source of supply prior to consideration of its submission. Likewise, a manufacturer can be required to submit proof of its ability to manufacture or produce required goods sought by the UN within the required time frame.

Rejection of Vendors failing to prove Availability of Products
Submissions of vendors who are unable or unwilling to provide the proof referred to above shall be rejected. The rejected submission shall be destroyed, or returned at the vendor's cost, if so requested.