Introduction to SAP PP- MRP Keys




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Production Planning



SAP Standard MRP Keys



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Sreehari Prasad






Planning files entries is the first step which checks by the MRP during the MRP run. If no entries are found for the selected parts then MRP will not plans these parts. You can create/check the planning files entries from MD20/MD21.
Planning file entries will be created automatically when you enter the relevant MRP type (example PD) in the material master MRP1 view. OR when there was a change relevant to MRP like stock change due to movement type/GR/GI or change in material master data.
You can run planning file entries consistency check in background before the MRP run.
To create/delete the planning file entries automatically from MDRE/MDAB transactions...
This will be useful to avoid the re-planning of the materials ( if planning file entry is not deleted after MRP run) and also to plan material (if planning file entry is not created).
1) Regarding Re-planning: sometimes after MRP run...planning file will not be deleted automatically (logically this should be deleted once the MRP is finished). Hence if you run the MRP again then material will be re-planned which is not required. So it is advisable to run the consistency check from MDRB transaction so this job will take care about these creation and deletion.
 2) Regarding Change: Planning file entries will be created automatically to plan the materials in the next MRP run once the changes will take place to the materials. The changes can be in Stock (example suppose you have done Goods receipts or you have performed the goods issue or any new requirements has come) OR the changes will be in master data like lot size has changed etc.
 You cannot see the changes happened to the parts in the planning file entries...that’s why consistency check run is required.



MRP KEYS
NEUPL(Regenerative planning): System plans all the materials that are contained in the planning file
 The final processing key is the online regenerative planning (NEUPL).  This is usually known as a “regen”, meaning a regeneration planning run. This is useful to run periodically, weekly or monthly, so that all planned orders are replaced with a more up to date planning situation.  Regeneration planning will ignore the net change indicators and run against the entire planning file.  One of the best reasons for this processing type is that it will eliminate those planned orders that have “aged in place”.  Aging in place is where planned orders that had not had any further net change indicators being set after it had been planned.
 These explanations for the processing keys should help clarify the differences a little better than is found in the standard SAP F1 help.  This is additional information you can utilize for own organizations documentation of the MRP planning run.
 NETCH: In net change planning only those materials are planned for which the net change planning indicator in the planning file has been set as a planning file entry. The system usually sets the indicator automatically as soon as a change is made to the material that is relevant to MRP.
Net change planning (NETCH) is where the MRP planning run checks the planning file and executes for only those materials with the net change indicator.  This is used on your more frequent planning runs as it only runs on planning file entries with the net change indicator, thus being a very efficient planning run.  Typically this is used as your nightly planning run so that it runs quickly to afford other programs within your organization to also complete in off hours.
 NETPL: The system only plans materials that have undergone a change that is relevant to the planning run within the period which you defined as the planning horizon. The system sets the net change planning horizon indicator automatically for these materials .
Net change planning run in the planning horizon (NETPL) works the same way as the net change planning but it is limited to the planning horizon.  The planning horizon is configured at the plant level, or if you are using MRP Groups, then it can be set there as well.  The planning horizon is the number of days for which MRP will consider requirements for planned replenishments.  Therefore this type of planning run should execute faster than the net change for it is limited to those materials to be planned within that planning horizon range.  For any long cycle time products, this is not a recommended setting.

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