Selection screen value not assigning to the value when executed for the first time

Hi ,
Im My program at selection screen there are company code, vendor account and open items at key date(takes system date as default value).
Facing problem at open items at key date - Open key date parameter is taken from LDB - KDF.
First time when I am executing the program it is taking system date value in the selection screen variable even though I have given the different date.
This problem is only when I execute for first time or press enter without giving company code.
Can any one please help us to come out of this problem.
Regards
Sri Bhargavi

HI,
     you can use the Event as AT SELECTION-SCREEN

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