Assigning contract to bom item

Hi,

We are creating contract with BOM sub item pricing Item category (TAP)and assigning manual condition type to sub item TAN.

And creating order with Same BOM materials sub item pricing and trying to assign contract at header item with item category TAP.

What is the problem here is that Pricing is not carrying out from Contract to Sales order ,when contract been assigned at header item category TAP and expecting price will be changed in sub item with item category TAN where manual condition type set up.

Can any body please help me out what can be done for the price change in sub item when contract getting assigned at header level item TAP.

Regards,

Pavan.