Hi,
You'll not find this Text in tables, but instead you'll have to use the FM READ_TEXT to get the text maintained in the Delivery Header.
Click on text headers to get the parameters to be passed to the FM to read text.
You may also check these tables.
STXH: Texts: Header
STXL: Texts: Line
Also refer the following.
http://scn.sap.com/thread/1246149
http://scn.sap.com/thread/1467548
Regards,
Amit
Message was edited by: Amit Srivastav