LO-VC BOM Quantity explosion question

Hi SAP Guru's,
I have a special request from my client where they would like to explode a bill of material but subtract the final Qty based upon the Sales Order quanity.
For example
Top Level Product (BOM)
     Component: 12345   Qty. 1
If I place and order for "Top Level Product" for a Qty of 10 pcs, the BOM component value should explode as 9
Here is what I have done as a test.
1. Created a new characterisic as: QUANTITY referencing STPO-MENGE.
2. Created a dependency: $SELF.QUANTITY = -1 (What this did was if the order was for 10pcs, the actual Componet value would then translate to -10.
3. Tried another dependency: $SELF.QUANTITY = Sales_ORDER_LINE_QTY -1.   IF I updated the BOM - CS02 to reflect a Fixed Qty or RC29P-FMENG = 'X' this process worked well.
My first question is there an simple way to write the dependency so if I used $SELF.QUANTITY would give me the correct result = 9 for the component BOM?
Or is there a reference table and field that I could use in the CT04 characteristic that will automatically populate the Sales Order line item Qty?   I tried multiple fields, but none worked: RCUKO - MENGE, VBAP-KMPMG and RV45A-KWMENG.
Thankyou

Not answered, just moved the question to the SD forum. THanks.

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https://forums.sdn.sap.com/click.jspa?searchID=18245760&messageID=5850243
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