Planning Run Type in the Initial Screen 
Use
You use the planning run type (Processing key indicator in the initial screen of the planning run) to determine which materials are to be planned.
Features
There are three different planning run types:
- During regenerative planning, all materials are planned for a plant. This makes sense when you are carrying out the planning run for the first time as well as later during production if data consistency cannot be guaranteed due to technical error.
The disadvantage of regenerative planning is the fact that the system has to deal with high capacity loads because all materials are planned, including materials, which may not be affected by the planning run.
- To overcome this disadvantage, it makes sense during production to carry out the planning run using the net change planning procedure. The only materials that are included in the planning run are those, which have undergone a change relevant to MRP since the last planning run, for example, because of warehouse issues or sales orders, changes to the BOM and so on.
The net change planning procedure makes it possible for you to execute the planning run in short intervals, for example, in daily intervals. You can thus always work with the most up-to-date planning result.
- You can use net change planning in the planning horizon to shorten the MRP planning run even further. The system then only plans materials that have undergone a change relevant to MRP within the planning horizon. In order to also plan changes outside of the planning horizon, you must execute the net change planning run in greater time intervals.
You define the planning horizon per plant or per MRP group in Customizing for MRP in the IMG activity Define planning horizon. The planning horizon should be at least long enough to cover the period when sales orders are received. It must also accommodate delivery periods and the total lead times of the materials.
In single-item planning, you can only choose between net change planning and net change planning in the planning horizon. Regenerative planning is not useful, because the material has already been defined and does not have to be determined after the evaluation of the planning file.
The system automatically flags the materials that have undergone a change relevant to MRP with a corresponding planning file entry in the planning file (see also Checking the Planning File and Planning Run Type).