
“First No.” or “Next No.” cannot be higher than “Last No.”
You have opened the Certificate Series window, and have entered values in the First No. or Next No. fields and in the Last No. field. However, the value in the First No. or Next No. field is higher than the value in the Last No. field. Since certificate series are sorted in ascending order, the value in the First No. or Next No. field must be lower than the value in the Last No. field.
Replace the values so that the value in the First No. field or the Next No. field is lower than the value in the Last No. field.