Update valid-to date in BOM with ECN

Question

Hi,
I'm trying to update the valid-to date in a BOM using an ECN number (e.g. i don't want it to be 12/31/999). I was wondering what the correct procedure was?
1) what type of ECN to use? (Change Master or ECR; or do both work)
2) if the BOM was already created without a change number, can you update the valid-to date later with an ECN?
3) i checked the forums on this site and it says to use without release key (how does this work)?
4) it seems when i delete a BOM item with an ECN it is gone forever..I just want those items to expire and a new one to be active. how do you do this?
5) can i do all of the above in CS02?
6) Also, how can i tell if ECN is active or not?
Any logical steps on how to update the valid-to date in the BOM would be greatly appreciated. The current forum content doesn't seem to provide the correct steps.
Thank you very much for your help.

Answer 1

Dear Priya Rajaram,
1.We can Use Change number with release key or without release key for
Changing the material BOM.
2.Use Change number with Release key for better control over the BOM to change
the valid to date for the entire BOM or for few BOM items.
3.Once when you use the change number and do the chnges for the material
BOM,it becomes valid as per the valid from date of the Change number.
4.For Eg I have created a Change number with Valid from date as 20.09.2007.
Using this Change number I'm changing the BOM of A,whose components are
say B - 1,
C - 1,
D - 1,
Now using the Change number I'm deleting the item D and saving,so the previous
BOM will be valid till 20.09.2007,and the new BOM be valid from 20.09.2007 i.e
with items B & C alone.
5.T codes For Change numbers are CC01,CC02,CC03.
<u><b>Reward points if useful.</b></u>
If any more query revert to Forums.
Regards
Mangal