Purchasing Requisition Template POXRQTMP.fmx. Why is Contract Number field not available on this fo

In iProcurement, when manually entering a Purchase Requisition, the field 'Contract Number' is available for data entry in the Supplier section.

We are creating 'Smart Lists' (shopping lists) in the Purchase Order module using the Requisition Template, and are unable to enter the Contract/Agreement number in the Supplier section.  We need to associate the Contract/Agreement number to the item at the line level.  Is there a way to activate this field on the Requisition Template form?

See attached document for illustration of the field in iProcurement, and absence of the field in the Purchasing Requisition Template.