BPM to add a material from Order Job Wizard

I am trying to build a BPM that adds material to the job that is created through the Order Job Wizard. I believe I want to be invoking the JobEntry.GetNewJobMtl BO and using the Fill Table by Query setter to set the job material field. I am doing this all from a post processing method directive on OrderJobWiz.CreateJobs.

Am I atleast on the right track here and I just need to set my parameters correctly or am I way off base? I dont have alot of experience with BPMs using callers so any advice is helpful!

On the right track. However, you will likely have to run a JobEntry.GetByID(jobNum) first to be able to tell the caller what job to add the new material to.