E BOM AND P BOM SAME BUT WHY 2____CRITICAL HELP

Hello Team,
From long back when i browsed through the SDN i was able to summarize the below,
1) E bom and P bom are always seperate.
2) Any changes in E bom will not automatically flow to P bom is required we need to do development using Z code.
3) IF customer requires to maintain E bom and P bom both identical then there is no need to maintain 2 boms one is enough
When i put all these infront of my client, he stated below
In his earlier work at automotive industry, he has seen maintenance of both E and P BOMs both are identical but there is a XYZ reason and asking me to find it out. He says he knows that XYZ reason but he wants me to find it out.
As i am new to SAP implementation i was totally confused, can any one help me on the same.
Critical please help.
regards,
satish

Thanks Vivek,
You suggestions are 100% correct.  Thanks for guiding me to correct channel.
I usually first try with all my the knowledge which i have got in earlier experience, then read the docs in sap portal if any doubts.Do trials in ides, sandbox, ask seniors, go through threads, even after all these when i feel i am not sure then i post thread as i feel to deliver the correct thing to customer.
From next time i will be still more cautious, do more home work on the same.
Apologies to the forum if i have followed some wrong path and have disturbed a lot.
Truth is this forum has helped me a lot in resolving many key issues.
Thanks a lot for all the help.
Regards,
Satish

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