Prepack purchase price is not updating

Hi ..

I created prepack article with generic article variants which has its own purchasing price. When I create Retial PO with prepack article purchase price needs to be total purchase price of its components. However which is not happening and system is asking me to enter the purchase price.

I created prepack article and generic article using mm41, what are the changes required to setup the automatic calculation of prepack purchase price from its components total.

Much appreciated your response.

Thanks