The Audit Button
For example, when you click Audit in PO Inquiry (VOI), you'll have to further click Header or Line because VOI shows information from two files: the PO header (VP1) and the PO lines (VP1B) files.
So, If you clicked Audit | Header, you might see something like this, a chronological list of changes to the PO header (VP1):
If you clicked Audit | Line, you’d see the changes made to the lines on the order: