Hi,
As per the standard doc, have you made these settings:
Cost Rollup:
The purpose of cost rollup is to include the cost of goods manufactured of all the materials in a multilevel production structure within the costs of the material located at the top of the structure. The costs are rolled up automatically using the costing levels.
- The system first calculates the costs for the materials with the lowest costing level and assigns them to cost components.
- The materials in the next-highest costing level (such as semi finished materials) are then costed. The costs for the materials costed first are rolled up and become part of the costs of goods sold in the next-highest level.This process is continued until the costing results of the highest material in the structure (such as the finished product) contain the cost of goods manufactured for every material in the structure.
For costing, you assign the costs in a cost estimate to cost components in Customizing for Product Cost Planning. The cost components split the costs of a material. In the cost rollup process, the data for these cost components is passed on to the costing results of the next-highest material.
Also, below is the link for your verification:
http://wiki.sdn.sap.com/wiki/display/ERPFI/Product+Cost+Planning+(CO-PC-PCP)
Bye
Sandeep