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  1. SELECT ... INTO
    If your query does not return a result (sy-subrc=4), then your internal table is not updated. You must be sure to check sy-subrc.
    If you need to check if a user changed a value in a sales order user exit, then the structures VBAKIN and VBAPIN will contain a value in the field that you are checking. For example, if you change the shipping point (VBAP-VSTEL), then in the user exit you wish to see if the user changed it or did the system change it, you would check for the value in VBAPIN-VSTEL. If they do not change a field, then it is INITIAL. If the user has changed it, it will contain the value that the user entered.