And after that i continued entry till assets section and on this stage i have saved as partial and close the application. When we re-open the application and select that "Start to the last position?, it goes on V3 form1. But my last position was on asset form.
Without seeing you application it is hard to be sure but it is likely there is either some logic or a field that has not been filled in that causes the app to stop in field v3. In system controlled mode all the procs are run up to the field you saved in when you restore from partial save and all the range checks for those fields are run as well. This means that logic in any of those procs or failed range checks could cause the app to stop.