Is it mandatory to make the costing for each item

 Hi Experts,

I am new on OPM Financials , well I have defined Calender and Legal entity is showing when we make the assignments in the calendar

After that I have define the Component Group, Cost component Classes and assign the component group.

I am using the Standard Costing. And when defining the items we have listed the prices on that time in MIO, now is it mandatory to make the item cost, resource cost and fixed overheads?

Thanks in Advance