GL-Posting F-02: Modifying Entry Screen

Hi Experts,

I want to modify the entry screen for GL posting (F-02 General Posting). On the screen "Add G/L Account Item" I want to set Field "Trading Partner" as default. So far I used the button "More Data" to get this field "Trading Partner".

Can anybody help me to set the field "Trading partner" as default on the entry screen?

Thanks

SIM