Re-costing of header material when Sub-item material BOM is updated

Hi ,

A sales order is created with a header material (HM) and coressponding sub items (SM1 & SM2 ) got populated automatically from the BOM.Now the costing for this three line items happened as expected i.e.,

For example :

Header  Material : HM

          Sub item1 :-      SM1

          Sub item2 :-      SM2

              MAP of Sub item 1 > SM1  = 20 USD

              MAP of Sub item 2 > SM2  = 30 USD

Costing in the main line item appears as 50 USD ( 20 + 30 USD) .

Now business go to the transactionCU51 and make the changes in the sales order BOM subitem1 ,material SM1 by adding or deleting items in the BOM. After that they are trying to re-cost the sales order and it is observed that only the corresonding sub item (SM1) is getting re-costed with new value.But the header item HM is not getting updated with the new values it still have the old values .

It would be really helpful if you can let me know what is the issue for this.

Thanks!

Regards,

Dileep.