user exits For Vl01n
i want to block the delivery aftercycle closing in VL01N for shipping point 1103
selection date not more that 3 days after closing.
For Order Type Is 2873 1901 2902
A popup Message Will Apper If Delivery Is After Day's .
So How Can I Solve This Issue Plz Help Me.
I Have No Idea About User Exits.