Intercompany pricing - how to get the same prices amounts of the customer's billing

Dear all,

My requirement is in the scenario of Intercompany billing:

- At the creation of the customer's billing, prices are automatically updated:

copy control between Delivery and Billing F2: "Pricing type" = C,

- So, at the creation of the Intercompany billing, prices are not the same:

copy control between Delivery and Billing IV: "Pricing type" = A.

I tried to set other pricing types in copy control, but results are KO.

Example:

-     Customer's sales order: Gross price = 20€ (valid on 01/07/14)

-     Customer's billing:  Prices are updated related to Pricing date --> 33€ (new valid price on 01/08/14),

-     Intercompany Billing: copied gross price = 20€.

QUestion: how can I get the 33€ value for the Gross price?

New routine (VOFM) to read the Customer's billing value (VBFA/ KONP)?

Or is it existing a SAP standard solution?

Kind regards,

Sebastien