How can I have the cost at 0 for one item ??

Hello,

I put the recipe with the status "Absolute/Archive" and I have always a cost. The cost is always the sum of "lower level".

I would the costing for an Item at zero.

I try to play with the status for the recipe and formula but I have always a cost.

Also, I try to play with the validity.

Whatever that I do, I have always a cost.

We copy the costing from the month to another month.

What is the best practice ? if I want a cost to zero for an item.

Thanks