Carrying Out MRP for LTP with an Independent LTP BOM 

Use

You can use an independent BOM for long-term planning. This means you can create a separate BOM for long-term planning different to the one used in operative planning.

By using an independent BOM in long-term planning, you have the advantage that you can simulate planned changes to BOMs in advance. Therefore, using long-term planning, you can determine in advance how the use of a different assembly or raw material would affect available capacity and the purchasing budget.

Integration

BOM explosion in the long-term planning run is carried out using the same master data and Customizing settings as in operative planning.

Prerequisites

  • In Customizing for BOMs, in the IMG activity Define BOM usage, you must create a BOM usage for long-term planning.

You create a new BOM usage by copying the settings of the BOM usage for production, for example.

  • In the IMG activity, Define allowed material types for BOM header, you must enter the BOM usage for long-term planning and copy the settings for the BOM usage for production.
  • In the IMG activity Define order of priority for BOM usages, you must create a Sel ID (selection ID for alternative BOM selection) specifically for long-term planning and enter the Selection priority of the BOM usages. You must assign priority "1" to the BOM usage "long-term planning". You should assign selection priorities 2 and 3 to the same BOM usages as you used for the Sel ID for MRP. In the standard system, the selection ID "01" is the sel ID used in MRP.
  • You must create a BOM with the BOM usage for long-term planning.
  • In the planning scenario, in the BOM selection ID field, you must enter the selection ID you created for long-term planning.

Features

When selecting the BOM in the long-term planning run, the system firstly searches for the BOM with the BOM usage for "Long-term planning", using the sel ID (selection ID) for long-term planning. The indicator for the selection of alternative BOM in the material master is used to determine the correct BOM:

Example:

 

BOM usage

Priority

BOM 1

" Long-term planning"

1

BOM 2

" Production"

2

 

Using the Customizing settings, the system determines that BOM 1 has the highest priority for long-term planning.

If you set the BOM selection to "selection by order quantity" in the material master record, the system checks whether the lot-size range of BOM 1 matches the order quantity. If the long-term planning BOM is to be used with a different lot size, the system checks BOM 2 and uses it, if necessary.

If you set the BOM selection to "selection by explosion date", the system checks BOM 1 to see whether the order date matches the effective date of BOM 1. If this is not the case, BOM 2 is used.

If you set BOM selection to "selection by production version", the system uses the BOM defined in the production version. However, this BOM must be below the quantity of the BOMs that are to be taken into account, which is selected by the system using the selection ID.