Use

The CMC uses order scheduling based on a range of coverage (ROC) for orders with an open-loop order code (stock-based priority settings) as defined in Customizing for order codes.

As demand-oriented planning of repair work in open-loop orders is not possible, the CMC determines when the stock level of unserviceable components must become serviceable, that is by which point in time the work centers must repair these components. It does this by using a ROC for each component. The CMC determines the ROC by considering historical consumption data (goods movements in the past) as well as planned future requirements (receipts based on purchase orders, purchase requisitions, and work in progress). The CMC uses the resulting ROC in days as the input factor (end-date) for order scheduling.

Prerequisites

You have activated automatic scheduling for the rotable order code .

You use FFF classes and MPN-MRP sets in your system. For more information, see the documentation on Inventory-Managed Manufacturer Part Number (IM-MPN).

You have defined at least one stock-based order code in CMC Customizing.

You have defined ROC parameters on FFF class level, and/or in CMC Customizing on CMC inventory group level and/or CMC profile level.

You have assigned the stock-based order code to PM/CS orders in the system.

If you want to use automatic determination of the backwards horizon based on historical Logistics Information System (LIS) data, you have maintained table TMCA to allow evaluation of goods movements of rotable parts.

Features

Rotable components are not really consumed, rather they are transferred between different storage locations, whether these be the technical object itself (such as an aircraft), a warehouse for serviceable components, a warehouse for unserviceable components, and so on. For this reason, goods movements of rotables are generally transfer postings. The LIS contains an information structure ( S464 ) that handles these transfer postings and updates stock information for relevant postings after you trigger automatic determination of the backwards horizon. The system considers all "requirements" for rotables as a transfer from serviceable stock to the technical object. Standard functionality supports the calculation of a forecast ROC, which is based on the current serviceable stock level, an (optional) target stock level, and a period-based demand stream. The calculation result is a ROC in days.

If reservations exist for the component the system checks whether the forecast ROC quantity covers the reservation quantity, or whether this is an additional "requirement" that is not covered by the periods-backward calculation. The number of periods backward, also known as backwards horizon, is part of the forecast ROC calculation. The horizon is the historic period in which the LIS looks for requirements to build up the demand stream. The individual horizon can be defined for the historic calculation.

Two methods exist to determine the horizon:

You define the ROC horizon in Customizing for the CMC, either in the CMC profile (general level), and/or the inventory group (plant level), and/or in the FFF class (material level).

This method requires a very sophisticated manual analyses of historic values, because all of the different possible components have a large variety of independent requirement patterns. Some parts may be slow-moving with an exchange rate of one or two per year, while other components may be transferred with a much higher frequency

Because of the independent requirement patterns of rotables, the automatic analysis of historical data provides more accurate and faster data. The system performs this analysis through report Time horizon to calculate periods backwards , and determines a hit rate that you enter in the periods backward field either in Customizing of the CMC profile and/or CMC inventory group, and/or in your productive system on FFF class level.

See also:

Maintaining ROC Parameters on FFF Class Level

CMC Inventory Groups

CMC Profiles

ROC Calculations

Executing Automatic Determination of ROC Horizon