regading F4 help Popup

Hi all,

I wanted to know that I have a selection-screen in which i have a select-option for company code where i m going for F4 help, so what i need is once F4 help is triggered i need customer number should come hard coded in the popup screen. But the problem is for one company code there are N number of customer , so is there any way to get a particular customer.

Neccesary help is appreciated.

Thanks,

satish