Exice tax in case of credit memo's

Question

Hi All,
             I have a scenario where in we are  supplying some matrrials to our customers . This material also has the federal excise tax which we charge in the form of a condition type and which is charged on the unit price of the material .
For Ex ;
Material ABC - PR00 - $ 100
Excise tax - (XYZ) - $ 2.00
My business user says that whenever they supply materials to their customers (say 10 quantity ) , they initially suply through a sales order which is a very normal scenario.
Assuming that the end user uses only 5 out of the 10, my business creates a credit memo for the remaining 5 on the end user . This is the present process.
But since my business says that they will pay back only the tax part to the end user and not the unit price of the material ( $ 100 in the above example for remaining 5 qts) , they don't want to issue a credit memo with the material ABC( since it has  the unit price + tax ) in  the sales order .
My business is coming up with a suggestion saying that we can create a dummy material ( say XXXX) and add this as a second line item in the sales order . And against this dummy material the excise amount will be charged . This is because they feel that whenever they create a credit memo they will use this dummy material (XXXX)and not the original material ( ABC) . They say they have some SoX compliance issues.
The above idea seems to be meaning less and sensless to me as this is not the best practice and secondly since this is a dummy material , I will get into problems maintaining stock and  while doing a delivery ,PGI etc ...
My question to the forum is that , is there a way where in if I create a credit memo to  the customer , I must be paying back only the tax amount (XYZ) and not the entire amount ( base price + tax).
To Illustrate the above example:
The original sales order will have netvalue of ($1000 ( $100 * 10)
Excise tax as ($ 2*10 ) = $ 20
so When I create the credit memo for the 5 unused quantities I should pay the end user only $10 ($2 * 5).
I am not sure whether (creating a Invoice correction request RK, will solve this issue).
I need some really good recommendations to handle the above scenario.
Thanks
Sridhar.

Answer 1

This is a standard SAP functionality. Usually a credit memo is referenced to an invoice and if you don't have a reference to an invoice SAP would consider that credit memo as due immediatly.
If you have an invoice to be referenced to this credit memo enter the invoice number in the invoice reference field in FB75 > payment tab and then enter the payment term. If you don't have an invoice reference enter V  in the invoice reference field and then the payment term, system will calculate net due date based on payment term.