PR triggered by the project

Dear all experts,

please help me on the following issue.

i assign a material to an activity, release the project and run mrp, i get the PR for the material.

i need the PR document type be ZPR, not the standard NB.

i enter ZPR in OPTT, but it doesn't work.

do i need to do anything else?

can i set the material PR type to be ZPR?

thanks a lot.

Judy