How to do backflush of alternate material in a bom?

Hi,
   My user wants to do choose alternate material at the time of backflushing  according to material availability..
currently we are maintaining as following priority - 1
                                                           strategy - 2
                                                            probability - for first material (100)
                                                             rest of material as  blank.
any body please guide me what should be the right procedure to achieve this.
Already iu have searched found a thread Can we define alternate material in a BOM  try to apply our expert suggestion but it is not working.
Kindly anybody help me to solve the issue.
Thanks & Regards
Sandeep Kumar Praharaj

Hi Ramagiri,
  I have gone through your document but my user wants he should select the component according to his requirement.
for that purpose i have opened the planned order in md12
select the first component make the usage probability to 0.
select the second component change the usage probability to 100
after that requirement has been transfer from first alternate component to second alternate component.
But after when i am trying to do the backflushing through MFBF second alternate component is not showing in overview screen it is still showing the first component.
can u please help me why it is happening & explain how to achieve this point as you mentioned
Thanks& Regards
Sandeep Kumar Praharaj

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