go to property palette of account number and select format mask enter 10 zeros (ie) '0000000000'. Then your problem will be solved.
In sql you can use lpad built-in function to do the above task.
select LPAD(12345678,10,0) acc_no from dual;
Thnx. If we want to show acount number like---> 0-0098 format then what should i do.I think now i have to make a pl/sql logic block for this