Validity Period
In the standard system, the effectivity of a BOM header or BOM item is defined by time, using the Valid-from date. For example, a BOM has 4 items instead of 3 as of December 12, 1999.
The validity period is the time during which the BOM header or BOM item is valid. This period is delimited by the following data in the BOM header and BOM item:
When you create a BOM, this date determines the point in time at which this BOM becomes effective.
If you create or change a BOM using a change number, the system takes the valid-from date from the change master record.
This date determines the end of the validity period of the BOM. The system default is December 31, 9999. If you change a BOM using a change number, the system determines the valid-to date dynamically.
If you change a BOM using a change number with a valid-from date, the pre-change validity period of the BOM header or BOM item ends at exactly 00.00 hours on this valid-from date.
If you change a BOM header or a BOM item with a change number, you generate 2 validity periods, as shown in the following example.
In a BOM, you replace component A with component B using a change number with a specific valid-from date (d1). The system saves both the status of the BOM before the change with the old component A and the status of the BOM after the change with the new component B.
You can assign a revision level to these validity periods. In overviews, you can display all validity periods of the BOM headers or BOM items.
Under certain circumstances, the sequence of validity periods can change.
