We should configure standard cost global setting from in "Accounting" tab under "Control Panel" box when configure system.
The following page will show up after click this button:
Then click "Inventory Cost Valuation Method" from left panel:
Then select "Standard Cost" from the combo box, you will get a warning:
Select "OK" to continue, then set account # for "Direct Material Price Variance Account" and "Direct Material Usage Variance Account":
Click then go to pick up account screen:
These two accounts should be Current Asset (AC), Debit (D) type.
Then you can go to next step.
in "Accounting" tab under "Control Panel" box when configure system.
then go to pick up account screen:
