¿How to identify the origin of the fields in the RTF template of the “Purchase Request PDF Report"?

Summary:

Difficulty identifying the source of fields in the RTF template of the standard report “Purchase Request PDF”

Content (please ensure you mask any confidential information):

We are working on customizing the standard "Purchase Requisition PDF Report" report, located in the /shared/Procurement/Self Service Procurement path within Oracle Fusion Self Service Procurement Cloud.

Our goal is to add new columns to the line detail sections, specifically for the EXPENSE and INVENTORY line types. However, when reviewing the provided RTF template (RequisitionPDFGenerate2), we found fields such as <?Requester?> or <?RequisitioningBU?>, which do not match the data model or actual XML elements, making informed customization difficult.