How The MRP Planning File Works

How this planning file works?  I have created a material with MRP type PD for netch and netpl, both entries are showing in the planning file (MD21).  How the system know which scenario to considers, netch or netpl or neupl?

The first process when you run MRP is that it check for the materials in the planning file enty with the relevant indicators(NETCH / NETPL).
 
When the materials are created with the relevant mrp data, then an entry is created automatically in the planning file(MD21).
 
In order to create (or to get the entry automatically) in planning file the basic prequisite is that you need to activate the MRP for the required plant (OMDU).
 
With respect to the selection criteria you take during the MRP run (MD02) like NETCH / NETPL, this indicator is checked for the material. if the material is marked for the relevant indicator than that material is planned.
 
So in order to plan a material PLANNING FILE ENTRY is must.
 
If you do not activate MRP (OMDU) then there will not be any entry in MD21.
 
So as soon as this is activated and you create any new material than the entry of this material is created automatically in the planning file.
 
So if you want to create any entry in planning file manullay you can go with transaction MD20.
 
The difference between NETCH / NETPL & NEUPL is:
 
When you select NEUPL (Regenerative planning), the system plans for all the material which are in the planning file.  This is mostly used when you run the MRP for the first time or in case like after major changes of master data or after mass upload of the materials.
 
When you go for NETCH planning, MRP first check for this indicator in the planing file and plans.  This indicator is checked if the material has undergone some changes with reference to the previous plan.

Changes like:

  • Changes in stock or in MD04 
  • Changes in purchase requisition, purchase order, sales order, reservations, dependent requirement, forecast requirement... 
  • Deleting reciepts and issue element 
  • Changes in material master concerned to planning run.
When you go for NETPL (net change planning in planning horizon), those materials are only planned which has undergone changes for the planning run in the specified horizon.  This is mentioned in the planning horizon.

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