valid from - valid to
in transaction cs02 we can see material bom change mode.
if any change done to the bom, new material addition or increasing consumes of some of availables etc, a change number is created.
And in this screen we can see these changes will rule from which date - up to which date.
i could not find the valid-to of this change in any table. But i see that in tables, stpo, stas there is a relation about this.
please write me about this relation, how to find valid to of the date.