Explode Bill of Material on Purchase Order

Question

When we create a standard NB purchase order, we would like to explode a bill of material for the 1 finished goods material and create MRP requirements for the warranty materials on the BOM.  Basically, we want a requirement there so we can create a PO for these warranty materials.  We have looked at subcontracting, but we are not wanting to supply these materials to a subcontractor we just want to purchase them from a vendor and bring them into our inventory.
We realize that we can explode the BOM if we start with a planned order.  However on alot of occasions we skip over the planned orders and purchase requisitions and manually create the PO.
Does anyone know of a process to explode the BOM from the PO? or maybe a user exit on the PO that would allow us to do this.  
We are currently on version SAP 4.6C.
Thanks,
Mark

Answer 1

Hi James,
As you rightly mentioned, the purpose of a BOM is to contain a list of materials. To create   
a sales BOM. use T.code CS01.
Here you give the usage as 5 - indicates sales and distribution as there can be production boms also with a different usage.
After you enter inside give the components that make up your main material, say music system containing
Itemcat          material               Qty  
l               2 mt wires                2
l               speaker                   2
so on, then save it.
For each of these you should have a material master created. For the main item ie., music system select the item category group as " ERLA " for header level pricing and
" LUMF " for item level pricing.
Maintain item category determinations in VOV4 as
<b>For item category group ERLA</b>
OR + ERLA                         -
>  TAQ ( Header level pricing )
OR + Norm +     + TAQ (higher level item cat ) -
> TAE
<b>For item category group LUMF</b>
OR + LUMF                         -
>  TAP ( Item level pricing )
OR + Norm +     + TAP (higher level item cat ) -
> TAN
This will setup the scenario you wanted. Now when enter music system in sales order with "  1 " quantity it will explode as
2 wires
2 speaker
as was the component quantity mentioned in CS01.
Hope it helps. Please reward if useful.
Thanks & Regards
Sadhu Kishore