Can MRP be set to create JobNum from SO OrderNum-LineNum-RelNum ?
The order release has to be marked as Make Direct in order for that link to be created. If the part is marked as Non Stock that gets done automatically, otherwise it will have to be check manually.
I have seen it NOT create a job in the specified format if there is already a job by that number. In other words, if someone already created the job, and then closed it, then it cannot create a duplicate, and therefore creates a new sequential number.
but if you have this selected and it is not behaving, you may need to call tech support.

