When I define surface finish as “anodized” all the items price is doubled.

This problem comes from misunderstanding the printout order after generating the Order List. This output generates three lists: Message List, Order list and Coating Plan list. Coting plan list is generated only if you set up Surface finish in project. To switch between lists click its header bar with title. Use Order list to print material quantity list and its cost.

When you switch to Coating plan list you will see the list of profiles that had been listed on Order list already. It does not mean that material cost increases the total cost of project. It only lists the profiles that have to be coated. Total cost of project is listed on Order list and stays unchanged.