GTM Transaction line - How to identify xml tag for inbound

Hi All,

We are importing sales order lines from ORacle EBS, data comes in through XML.

All data is shown in GTM except, First name and last name.

Please suggest, how to find correct tag to add in XSL style sheet for 'First Name' and Last Name

Edit: Attached current .XSL file used to transfer data from EBS = > GTM

Thanks