The terms and conditions on the front page of the PO, the general conditions annexed to the PO, and any attachments or documents referred to and explicitly made part of the PO, constitute the Contract between the UN and the vendor and govern the parties' respective obligations. If necessary, the Procurement Staff may add special instructions to the vendor under the POs which then should be made part of the Contract.

The solicitation documents and the PO shall state that additional or inconsistent provisions proposed by the vendor shall not bind the UN, unless agreed to in writing by a duly authorized official of the UN in order to avoid a "Battle of the Forms".

If changes to the forms of the UNGCC are required, the UN/PD Contracts Officer or, in the case of Field Missions, the Legal Officer should be consulted in the first instance. For substantive changes to the UNGCC, the advice of OLA must be obtained.

The Procurement Officer/Assistant shall ensure that a copy of the countersigned original, preferably in electronic format, is sent to the Requisitioner and the Accounts Division.

For low-value purchases, currently fixed at under USD 4,000, the Procurement Staff or other authorized official shall follow procedures laid down for low-value procurements.