Field help (BOMDAT)

The BOM header shows validity start and end dates.
If the start date is not entered, it means that the BOM is valid for a date prior to the end date.
If the end date is not entered, it means that the BOM is valid for a date greater than the start date.
Validity dates are also associated with the links. They are initialized according to the dates in the header and must be within this date range.