Activity in Work Center

Dear All,

My question it's regarding at activity in work centers.

I defined "setup time" like first activity, and I established an value for the plan price, for the activity type.

Normally, this setup activity it's applicable just for first piece and for the rest no!

But now, if I intend to produse 100 objects, this setup time it's multiply by the number of pieces.

Can somebody to say me, how can I configure thus the setup time be applicable just for one piece.

Thank you, very much!

Marian