BOM exlosion date and basic scheduling date

HI gurus,
I am new for SAP, and I currently learning basic date scheduling and BOM explosion.
My doubt is if during requirement planning bom is exploded to determine requirements then, why again on basic start date bom is exploded?
if this is only in case of alternative bom then also selection of bom and its explosion takes place on the day of mrp run to determine requirements,still in this case on basic start date why bom is exploded?
please help me. correct answer will be rewarded in points!!
Akshay Naware

Hi Akshay
Your question is not clear. On the MRP process the BOM is exploded only once for each planned order. Under which circumstances the BOM is being exploded again?
Please observe that there is a customizing to determine which BOM explosion date will be considered by MRP. You can find on transaction OPPQ, under section BOM Explosion.
The following note also provides a very detailed explanation of the BOM explosion and master data selection:
412736 - MRP: PP master data selection (explosion date)
BR
Caetano

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BOM exlosion date and basic scheduling date

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