In my program, there is a field Lot Numbers having lenght 3 digits....so records
come only till 999.....
now i want that lenght converted to 4 digits, because i already used till 999 and want to
use 1000 and so on....
I go to in my ztable and change its field length, it changed successfully....but when i
craeting new entries in 4 digits like 1000, 1001 and so on, not taking and giving error message that "An entry
already exists with the same key"...