How to block the creation of a Sales Orders without a linked Purchase Order

Question

Hi. I'm trying to block the creation of a Sales Order that doesn't have a linked Purchase Order. The first thing I did is using the SBO Transaction Notification as follows:
IF  @transaction_type = 'A' AND @object_type='17'
BEGIN
     IF (SELECT PoPrss FROM ORDR WHERE DocEntry = @list_of_cols_val_tab_del) = 'N'
     BEGIN
          SET @error = 1
          SET @error_message = 'Purchase Order Missing...'
     END
END
This works good. I create the Sales Order, I tick the purchase order field on the logistics tab, I click Add, and then the purchase order window appears...
Then, the problem begins... If I click the Cancel button, the purchase order is obviously not created, but the Sales Order is created.
Can someone tell me how to block the creation of the sales order If the user press the cancel button on the purchase order window (and the purchase order is not created)
As far as I can see, after clicking the add button in the sales order document, the Sales Order is created on the DB. If there's no way of blocking the creation of the Sales Order, can I avoid closing the purchase order window by the SBO_TransactionNotification? (if the purchase order has not been created)
Thanks...

Answer 1

Hi Yail,
I think you can't close the purchase order with the stored procedure.
Try to catch the Event when the user click on Cancel button.
So you can list the vents with event logger : https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/ede3be37-0e01-0010-1883-cd1b5293473e
You can block the cancel button and force the user to create the purchase order.
Hope i help you
Best regards
Michael