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Partner function adding trigger on sales order header

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Hello ABAP Experts
I have following question about sales order user exit.
My client requirement is partner function data need to be updated from add-on table when creating sales order or changing sales order.
1. Input collective number on "Order Data" tab in SO header and pressing enter key
2. Program read add-on table using above collective number and update partner function data on sales header

Firstly i tried to change INCLUDE ZXV09U04 in function module EXIT_SAPLV09A_004 for updating partner function but this program is called when creating sales order. For my case, the program needs to be called when user input collective number and enter key. How can i trigger this behavior?
i need to change MV45AFZZ program and function module EXIT_SAPLV09A_004 needs to be called from MV45AFZZ??

thank you very much for your support on this.
Regards, Hiro

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