MDO3 enhancement points or UsserExits

Hi,

I am having a requirement which needs me to find the userexits or enhancements points for MD03 (To create PR using the MRP method). With my search in SDN i found that LMDZU001 and LMDR2001 are the two enhancement points. I kept breakpoint in each of the components of these enhancement points but the control did not stop at any point.

Can anyone out there please suggest me if i am doing anything wrong? If possible can anyone direct me to any links or docs?

Any help is really appreciated.

Thanks in advance,

Karuna.