Reuse Mode (SAP Library - Production Planning and Detailed Scheduling (PP/DS))

Reuse Mode

Definition

Setting that controls how a procurement planning heuristic processes existing procurement proposals.

Use

The following table shows the procurement planning heuristics for which the reuse mode is relevant:

Name	Description	Algorithm
SAP_PP_002	Planning standard lots	/SAPAPO/HEU_PLAN_STANDARDLOTS
SAP_PP_003	Planning shortage quantities	/SAPAPO/HEU_PLAN_DEFICITS
SAP_PP_004	Planning standard lots in three horizons	/SAPAPO/HEU_PEGID_PERIODIC_LOT
SAP_PP_005	Part period balancing	/SAPAPO/HEU_PART_PERIOD
SAP_PP_006	Least-unit cost procedure (external procurement)	/SAPAPO/HEU_PUR_PLANNING
SAP_PP_013	Groff procedure	/SAPAPO/HEU_PART_PERIOD
SAP_PP_C001	Planning standard lots for continuous requirements and receipts	/SAPAPO/HEU_PLAN_COPRODUCTS
SAP_PP_SL001	Planning standard lots with consideration of shelf life data	/SAPAPO/HEU_PLAN_STANDARDLOTS

The following reuse modes are available:

· Use suitable receipts

· Delete unfirmed receipts

· Delete unfirmed receipts, re-explode firmed receipts

· Re-explode plan

The reuse modes are described in the following sections.

Use suitable receipts

For this reuse mode, the standard heuristic SAP_PP_003 for planning shortage quantities differs from other procurement planning heuristics as follows:

· Other heuristics

The heuristic uses the net requirements calculation to determine the uncovered requirements. The heuristic only takes account of the firmed receipts, meaning receipts with the status PP firmed. Using the procurement quantity calculation and source determination, the heuristic then determines procurement proposals for the uncovered requirements. However, before the heuristic creates a new procurement proposal, it searches in the reuse interval for an existing, unfirmed “suitable” procurement proposal. “Suitable” means that the receipt has the same source of supply, the same receipt quantity, and the same characteristic requirements. For products with discrete receipts, the order priority must also match. If several suitable receipts exist in the reuse interval, the heuristic selects the receipt based on its availability date/time and the reuse strategy defined. The heuristic only creates a new procurement proposal if it does not find a suitable receipt in the reuse interval.

· Heuristic for planning shortage quantities

The heuristic uses the net requirements calculation to determine the uncovered requirements. The heuristic not only takes account of the firmed receipts, but also the unfirmed receipts. Unfirmed receipts are therefore regarded as “suitable” for the net requirements calculation. The heuristic then determines new procurement proposals for the uncovered requirements or reduces surplus receipts that are not firmed. Since the heuristic already reuses unfirmed receipts in the net requirements calculation, the reuse interval and the reuse strategy are not relevant.

Delete unfirmed receipts

In this reuse mode, the heuristic deletes existing, unfirmed receipts. In this action, the heuristic for planning shortage quantities also differs from other heuristics as follows:

· Other heuristics

The heuristic uses the net requirements calculation to determine the uncovered requirements and creates procurement proposals for these uncovered requirements.

· Heuristic for planning shortage quantities

The heuristic takes account of the unfirmed receipts during the net requirements calculation. After the net requirements calculation, the heuristic deletes the unfirmed receipts and substitutes them with new receipts of the same quantity.

Delete unfirmed receipts, re-explode firmed receipts

The heuristic executes planning as in the reuse mode Delete unfirmed receipts. In addition, it re-explodes the plan (PPM plan, iPPE process structure, or PP/DS runtime object) for the fixed in-house production orders, provided the order status allows this. For a re-explosion, an order may not have any of the following statuses:

· Firmed input

· Fixed date

· Released

· Started

· Partially confirmed

· Finally confirmed

· Partially delivered

· Finally delivered

Re-explode plan

The heuristic executes planning as for Use suitable receipts. The heuristic then re-explodes the plan for unfirmed and firmed in-house production orders. It is only possible to re-explode a firmed in-house production order if the status of the order permits this (see above).

Determining the reuse mode

Before a heuristic run, the system determines the reuse mode automatically using the following reuse modes:

· Reuse mode in the planning file

· Reuse mode in the settings for the procurement planning heuristic

· Reuse mode in the settings for the MRP heuristic

This reuse mode is only relevant if you call the procurement planning heuristic using an MRP heuristic.

For more information, see Determination of the Reuse Mode.