How to exclude Production Order Type from MRP

Hi,

is it possible to exclude certain Type of Production Order from MRP?

We have Production Order TYPE LMRZ (production order type for Development) and we'd like to excluded from MRP.

SO, no matter what we do with this type of production order, no influence to MRP. Nothing should appaer in MD04.

Is there a setting which allows this?

Best regards

Bojan