It is not necessary to enter the start serial number when the serial numbers to issue are not in a row.
If the product is managed with serial numbers, only this number is necessary to determine the stock to issue.
If this is not the case, the lot, sub-lot and location (depending on the management method for the product) are necessary.
For credit notes, specify the first serial number that is involved in the receipt movement. This serial number must exist in the database but it is possible to enter a serial number which does not exist.