extra column in vf04

Hi gurus i woul like to know how can i add a new column in tx

vf04

The field I want to add is available from the tx va03 Sales Header Data > Purchase Order Data tab (Ship-to party > Your Reference field. VBKD-IHREZ_E).

but , this particular field is not available from the list of fields to choose from

Does anyone have any suggestions on how i can get this field included as a selection field, and therefore have it as a column in the main Overview table?

Edited by: Alejandro Romero on May 21, 2008 5:05 PM

Edited by: Alejandro Romero on May 21, 2008 5:06 PM