Forum Post: Loop thru PO Items (Post-Write)

I have many years experience with Visual Basic, but I'm having a hard time finding the starting spot.  I am trying to look thru the item list in PO detail to verify if a number of UDF's are entered.  I'm OK with validating the data from the list.  My issue is my starting spot for objects and retrieving the data from the list. Can someone pass me an example of a VBScript loop for PO line items when the script is fired from the accept button on the PO dialog? Thanks!