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Example: Selection of Date Effectivity (PP-BD-BOM) 
Use
If you have processed a BOM with reference to a change number, several header records or item records exist for the changes.
If an item becomes invalid before the key date, the system also archives the corresponding BOM header. This is required as a reference in the archive in order to later assign the item to the correct BOM.
Example
On January 1 1997 you created a BOM for the material M-1 with two items.
Y ou deleted the item 20 with a change number on January 1 1998.You want to delete all data records that
lose their effectivity before July 15 1998. You plan an archiving run and enter a variant. In the variant, choose Selection of date effectivity and enter July 15 1998 as the key date.When you start the archiving run, the system look
s for all data records that lose their effectivity before July 15 1998. Since item 20 is invalid before the key date it is archived and deleted from the database. The system also places the BOM header in the archive, as reference, but does not delete it from the database.