Costing Method Standard means you set the cost you want manually on the item card. In this case you have standard cost 0, so whatever cost you have on the consumed Components, the cost for the finished item is 0 (the difference between the standard cost and real cost is posted as variance). Change the cost on the item card and revalue earlier transactions via the revaluation journal.
The cost of the finished item is 0. The cost of the raw materials are all posted as variance. You need to enter the desired cost (2555 mpo?) in the Standard Cost field on the item card of the finished item. Then future output will get that value. For earlier transactions, you need to reavaluate then through Revaluation Journal.
Standard Cost Worksheet is designed to roll up cost for many items, for multilevel BOM:s and using calculation factors. If you only need to roll up the cost for one item, press Item-Manufacturing-Calc Standard Cost on the Item Card.
Go to Item Card, press Item-Manucafturing-Calc Standard Cost
In the Standard Cost Worksheet, press Function-Roll up Standard Cost. Enter the Item No. of the finished item, press OK to generate the lines. Then press Functions-Implement Standard Cost Change, enter the Item No. of the finished item. Press OK to implement and then go to the Item Card and verify.