Adding An Edit to Logistics Invoice Verification

Question:
I want to add an edit to logistics invoice verification to prevent a user from creating an invoice if they have created the po and received goods against the po. I tried using SE80 to assist in where to place my code. I thought I had found the screen and the associated PAI module where my edit should go. However, the edit is still not being executed. Does anyone have any suggestions on how to determine where to place my edit? Thanks.
Answer:
Smith,
Use the method CHANGE_AT_SAVE in the BADI INVOICE_UPDATE. This works if the user tries to save the LIV document.
We are also looking at adding lot of code in LIV user exits. Do have any specific information on how to use some of the other user exits? We have one Gap - How to bring the condition records via EDI/IDoc into SAP. Do you know of a solution?
Kumar

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