MPS..........

Question

Hi friends,
Can some one please tell me the concept and which scenerios we have to use Master Production Scheduling (MPS)?
Some one told me that we are using MPS for component marked as "A part".
What is this A-part in MPS?
Actually I discussed lot with friends but all are giving different opinions. And also I know to some extenct about the meaning of MPS. Eventhough i want opinion from experts like you.
Please help dear experts
I will award for each deserving points.
Regards,
Imran Shek

Answer 1

hi
the MPS component (PP-MP-MPS) to flag materials, which greatly influence company profits or which take up critical resources, as master schedule items and to check and plan them separately with a series of special tools.
MPS is executed using the same principles as MRP.
The aim of MPS is to reduce storage costs and to increase planning stability. This is useful in the following cases:
To ensure that there is good material availability, various floats and a safety stock are entered, which inevitably lead to high stock levels. Thus, high storage costs are incurred, especially for valuable materials.
The master plan of these materials greatly influences the entire production process: The planning of the dependent parts depends on the planning result of the finished products and main assemblies, even if the finished products represent a small share of all the materials to be planned. Frequent changes at finished product level can render the complete MRP run unstable.
Prerequisites
You have set an MRP type for master production scheduling in the material master (MRP 1 view).
You define MRP types in Customizing for MRP in the IMG activity Check MRP types.
You have entered a planning time fence.
You can define a planning time fence per material or you can also use the MRP group in the material master to assign a planning time fence to a material. The planning time fence that you assign manually has priority over the planning time fence in the MRP group.
The firming type, which you have defined in Customizing, determines whether the system is to create procurement proposals for material shortage in the planning time fence and how these procurement proposals are to be scheduled.
Process Flow
You start the total planning run for master schedule items or single-item planning for master schedule items.
In contrast to the MRP run, this planning run only plans the master schedule item level. The system creates dependent requirements for the BOM level directly below the planning level. However, this level and lower levels are not planned.
Depending on the settings of the MRP type, any changes to be made to the master plan are only proposed within the planning time fence. Outside of the planning time fence, procurement proposals are created as usual.
You use interactive planning to check the planning result and finely tune the master plan for the master schedule items. You hereby pay particular attention to planning and scheduling the procurement proposals that are required to cover shortages within the planning time fence.
Once the master plan has been finely tuned for the master schedule items, you start the total planning run for all dependent parts. Various options exist here:
You can start the planning run for all BOM levels directly from the total planning run for MPS. To do this, you set the indicator Process MRP materials in the initial screen of the total planning run for MPS. The system will only plan the other BOM levels if this indicator is set.
If you want to plan the total BOM structure for individual master schedule items only, you can work with the single-item, multi-level planning in the menu for MPS.
You evaluate the planning result using standard evaluations or user-specific evaluations.
-ashok