How To Stop Auto Save while clicking End Transaction Button in Ic_agent Buss Role

My Requirent :-

In Ic_agent Bussiness Role, while clicking End Transaction Button it will go to home page at the same time saving document with madatory field and all empty. Because of this big issue going b/w vendor and my organization everymonth end payment for service kilometer they travelled. our organization using 6.0 crm version. i was trying to stop saving by writing code ORDER_SAVE Badi, but it is stopped saving and same screen while user fill all mandatory fields while clicking save no navigation at all. Please Provide some solution for this problem.

Thanks,

anbu