How do i input value?

I am using KOB1. So from my ALV program if one line clicked then it will call KOB1. Now the problem is in the KOB1 three fields re required field. 1. Cost center, 2 Order and 3 posting date. 1st two have there own parameter ID. But Posting date doesnt have. But I have to send value from my program for that field. So If Posting date doesnt have any PARAMERTE ID,then how can i send value there?