New Cheque lot series Creation

Dear all,

My client has created a dummy check lot series of 3 digits, ie

LOT 1

From 001

To 005.

Used Checks 005.

Now when we want to create the actual check lot series of 6 digits, it is not taking.

sat

LOT 2

From 000001

To 00000100

How can I rectify this error.

Points will be assigned.

Thankyou

Srilakshmi