MPN-MRP Set

Definition

The parts in a manufacturer part number-material requirements planning set (MPN-MRP set) are a subset of the inventory-managed manufacturer parts in one FFF class and should be treated as fully interchangeable parts in MRP, inventory management, and the availability check.

Every MPN-MRP set has exactly one leading part that represents this MPN-MRP set from the MRP view. If the joint stock of all of the parts in the MPN-MRP set cannot satisfy the requirement, the leading part is procured substitutionally for the parts in the MPN-MRP set.

Working with MRP Areas

  • If you work in MRP without MRP areas, the following applies:

    MPN-MRP sets group the parts in an FFF class in a plant without overlap. Every part in an FFF class can only belong to a maximum of one MPN-MRP set in a plant.

  • If you work in MRP with MRP areas, the following applies:

    MPN-MRP sets group the parts in an FFF class in a plant and an MRP area without overlap. Every part in an FFF class can only belong to one MPN-MRP set in a plant and an MRP area.

    A part can belong to different MPN-MRP sets in a plant, if the MPN-MRP sets belong to different MRP areas.

An MRP area is an organizational unit with one or more storage locations in a plant. A storage location in a plant can be assigned to only one MRP area. Every plant has a plant-MRP area with all of the storage locations that have not been allocated to an MRP area of their own.

Use

You can group interchangeable parts in an MPN-MRP set. The system considers the stock and requirements of parts in an MPN-MRP set as cumulative.

  • For MRP , this means that the system generates a new procurement proposal, only if the requirement for a part in the MPN-MRP set can no longer be covered by the overall stock of the other parts in the MPN-MRP set. The procurement proposal is generated for the leading part in this MPN-MRP set.

    Example Example

    In a plant, the MRP for part D is subject to the MRP area and the MPN-MRP set, and ranges from either the parts B , D , E (MPN-MRP set C in MRP area B , part D is procured) or the parts A , B , C , D , E , F (MPN-MRP set B in MRP area A , part C is procured).

    End of the example.

  • With regard to the automatic availability check in Sales and Distribution (SD) for sales orders, the stock that is used to fulfill a sales order is taken from the cumulated stock of all parts in the MPN-MRP set. If the available quantity of the originally ordered part is too low to fill the order, the system adds one or more parts from the same MPN-MRP set to the order.

    Example Example

    The availability check in SD for part D is dependent on the MRP area and the storage location, and applies either only to parts E and F , or also to parts A , B , C , and E . Parts X , Y , and Z are never taken into account by D in the availability check, although they belong to the same FFF class.

    End of the example.

    In the manual availability check in Plant Maintenance and Customer Service (PM/CS) for maintenance and production orders, the system proposes other interchangeable parts if a material component is not available. For this purpose, the system takes account of all fully interchangeable parts in the same FFF class; different colored traffic-light icons show whether they belong to different MPN-MRP sets.

Structure

You define each MPN-MRP set for one plant and one MRP area (if necessary).

Note Note

If you work without MRP areas, the easiest way to define an MPN-MRP set is to group all the parts in an FFF class into one MPN-MRP set for each plant.

If you work with MRP areas, the easiest way to define an MPN-MRP set is to group all the parts in the FFF class into one MPN-MRP set for each plant and plant-MRP area. The system automatically creates the plant-MRP area, which has the same number as the plant and includes the whole plant with all the storage locations that are not planned separately. All parts also belong to the plant-MRP area.

You assign selected parts (for example, those which you plan separately for certain customers and which you want to have available) to an MRP area that you have created for this purpose by creating the segment for the MRP area in the material master. You group these parts in one MPN-MRP set for this MRP area.

End of the note.

Integration

Planning File

On changing an MPN-MRP set (by adding or deleting part for example), the system makes an entry in the planning file, because requirements and replenishment elements can also be transferred in or out with the part. The entry is always for the leading part in the MPN-MRP set irrespective of the affected part.

A separate entry is written to the planning file for parts that have been deleted from an MPN-MRP set.

For additional information about the processes in material requirements planning and the use of planning files, see the PP documentation - Material Requirements planning , under Checking the Planning File .

Product Group

Exactly one product group on the plant level can be generated for every MPN-MRP set. You cannot generate different product groups with different MRP areas on plant level. Product groups and MPN-MRP sets contain the same parts. Once a product group has been generated, the system ensures it remains consistent with the MPN-MRP set because changes to the MPN-MRP set also change the product group.

You can use the product groups in the overview functions (for example, in the stock/requirements list) to select all the parts that belong to an MPN-MRP set. Do not use these product groups, which represent MPN-MRP sets, in Sales & Operations Planning (SOP).