Range of Coverage Calculations

Use

The CMC considers the range of coverage (ROC) for components in operations/orders in stock-based calculations.

Features

To determine the ROC the CMC performs a consumption-based calculation, and a reservation-based calculation, if reservations for the relevant component exist. You can define the parameters to be used by the ROC on FFF class level, as well as in Customizing for inventory groups and/or CMC profiles.

The ROC calculation is based on the consumption of the corresponding component, the amount of serviceable stock available for that component, and the number of unserviceable components that are currently in the repair process.

Depending on the parameter values, the system uses backward or forward horizons (depending on which is lower) and considers the maximum due date of the component as well as the maximum number of unserviceable components that are permitted, if defined. If you have defined a target stock quantity in the ROC parameters, the CMC schedules the order end date to coincide with the point when the actual stock equals this target stock. In all other cases, the CMC schedules the order to finish when there are no components left in stock.

The CMC checks whether reservations exist for the component and whether the ROC covers this quantity, or whether additional work is required that has not been considered in the backwards calculation.

  • Consumption-based calculation

  • Consumption = Total consumption values in defined period ÷ ROC backwards horizon

  • Stock level = Total actual stock - Target ROC

  • ROC = Stock level ÷ Consumption

  • End date = Latest consumption date + ROC -1

If the end date is later than maximum turnaround time (max. TAT), the CMC uses the max. TAT to schedule the order.

For ROC orders the CMC sets the ROC date to the nearest working day, if necessary.

  • You define the calendar used by the ROC calculation in Customizing for the CMC Profile.

Recommendation Recommendation

We recommend you use a seven-day and 24-hour calendar.

End of the recommendation.

  • If the ROC parameters are on FFF class level, the CMC adds up the values of all of the components in the relevant FFF class.

  • Reservation-based calculation

  • BTRES1 = Stock - consumption x time

  • Time = Time now till the reservation date, or

  • If the reservation is in the past, Time = 1

  • BDIFF = BTRES1 - Reservation quantity + (Open orders x Time)

  • If BDIFF < 0, New stock = Stock + BDIFF

  • ROC = New stock ÷ Consumption

  • If the order is locked by another user, the CMC calculates the ROC but does not update the order.

Caution Caution

In this case to update the ROC for the order, you must wait until the order is no longer locked. The CMC displays the old date in the Order/Operation data screen area and the new ROC value on the Material tabstrip, if active.

The activated message log displays whether the order is locked by another user, and provides a message if the ROC cannot be updated. Therefore, we recommend you activate the CMC message log on the selection screen.

End of the caution.

See also:

Maintaining ROC Parameters on FFF Class Level

CMC Inventory Groups

CMC Profiles