The 'from number' is the lower limit of an interval.
For internal intervals, the 'from number' is the first number to be assigned.
For external intervals, it is the lower limit.
External intervals can only contain either
letters or numbers, as sorting can differ between platforms (Code page):
| Allowed: | 000001 to 999999 | |
| AAAAAA to ZZZZZZ | ||
| Not allowed: | AAAAAA to 999999 |