19 O.S. § 1507(B)

County officers and department heads may designate two employees to act as requisitioning officers for their department. The names of the designated officers must be filed with the county clerk and entered in the minutes of the board of county commissioners.
19 O.S. § 1501(A)(4)

In the county purchasing process, the requisitioning officer has the following general responsibilities:

• Write specifications for supplies, materials, equipment, and information technology and telecommunication goods and services requisitioned by their office in sufficient detail so that the purchasing agent, vendor, and receiving officer know what is being ordered and that the items received are the same as those ordered:
• 19 O.S. § 1505(A)(1)
• Refer to Chapter Ten, “Writing Specifications,” for help with writing
• Complete the requisition part of the Requisition - Purchase Order - Claim form;
• Communicate with the receiving officer to ensure that the items received are the same as those requested.

These employees are authorized to sign requisitions in the absence of the county officer or department head or administrator.