Distribution of Capacity Requirements (SAP Library - Capacity Evaluation (PP-CRP-ALY))

Distribution of Capacity Requirements

Use

You use a distribution to specify how the system distributes the capacity requirements of an operation that extends over several days; that is, how much capacity requirement is allocated to the affected capacity type in the work center on each of the days.

You use the distribution for setting capacity requirements according to periods, for example:

In the capacity evaluation
In the extended evaluation
In the planning table for capacity leveling
In repetitive manufacturing (REM)
In sales and operations planning (SOP)

Here, the relevant information for capacity requirements is per period. The system determines the daily capacity requirement using the distribution and cumulates this periodically to the capacity requirements in the periods.

Lead time scheduling can determine operation dates, operation duration and capacity requirements for the operations in an order. It does not determine a distribution for the capacity requirements. In the planning table with a continuous display, the system assumes that the capacity requirement of each operation is distributed evenly over the working time of the affected capacity type in the work center. In the case of the applications with capacity requirements displayed over periods, you must define the distribution of the capacity requirements explicitly.

Features

A distribution is described by a distribution function and a distribution strategy.

Distribution function

You define the distribution function using basic values. The basic values specify after what percentage of operating time a particular percentage of the capacity requirement for the operation is loaded to the affected capacity type. The system-internal default basic value for a distribution function defines that after 0% of operating time, 0% of the capacity requirements are loaded.

Distribution strategy

You use the distribution strategy to specify:

Whether the system is to distribute the capacity requirements between the earliest or the latest start and finish dates of an operation
Whether the distribution of the capacity requirements is to be discrete or continuous

The difference in capacity requirements between two basic values of a distribution function that immediately follow one another defines a partial capacity requirement that can be discretely or continuously distributed:

In the case of the discrete distribution, the later basic value defines the day on which the partial capacity requirement is loaded.
In the case of the continuous distribution, the partial capacity requirement is distributed over the days between the two basic values.

Whether the distribution is based on the Gregorian calendar, the factory calendar or the operating time of the affected capacity type

Based on the distribution function and the distribution strategy, the system determines the operating time that is relevant for the distribution and the dates on which the basic values for the distribution function fall.

Distribution based on the Gregorian calendar

Here, all the days onto which the operation extends are relevant for the distribution of the capacity requirements, including the days on which the operation starts and finishes. In the case of continuous distribution, the system distributes the partial capacity requirement, which has to be loaded between two basic values, evenly over all the days that lie between the basic values. In the case of discrete distribution, the system loads the partial capacity requirement on the day on which the later basic value falls.

An operation extends over 10 days. You defined for the first basic value of the distribution function that after 50% of the operating time, 50% of the capacity requirement should be loaded.

Therefore, using the distribution based on the Gregorian calendar, 50% of the capacity requirements must be loaded after 5 days. In the case of continuous distribution, the system distributes this partial capacity requirement evenly over the 5 days, that is, 10% of the total capacity requirement is loaded on each day. In the case of discrete distribution, the system loads the partial capacity requirement on the fifth day.

Distribution based on the factory calendar

Here, only those working days onto which the operation extends are relevant for the distribution of the capacity requirements, including the working days on which the operation starts or finishes. In the case of continuous distribution, the system distributes the partial capacity requirement, which has to be loaded between two basic values, evenly over all the working days that lie between the basic values. In the case of discrete distribution, the partial capacity requirement is loaded on the day on which the later basic value falls.

An operation extends over 10 days. According to the factory calendar, there are 2 non-working days during this time. You defined for the first basic value of the distribution function that after 50% of the operating time, 50% of the capacity requirement should be loaded.

Therefore, using the distribution based on the factory calendar, 50% of the capacity requirements must be loaded after 4 working days. In the case of continuous distribution, the system distributes this partial capacity requirement evenly over these 4 working days, that is, 12,5% of the total capacity requirement is loaded on each working day. In the case of discrete distribution, the system loads the partial capacity requirement on the fourth working day.

Distribution based on the operating time of the capacity category.

Here the daily operating times of the affected capacity category are relevant for the distribution of capacity requirement. In the case of continuous distribution, the system distributes the partial capacity requirement, which has to be loaded between two basic values, over the working days that lie between the basic values, proportional to the daily operating time of the capacity category. The discrete distribution is not relevant for the distribution based on the operating time.

The operation duration determined during lead time scheduling is 80 hours. The affected capacity category has a daily operating time of 8 hours. On the start date, the operation is processed in 2 hours of operating time. The operation finishes on the eleventh day, after 6 hours of operating time. You defined for the first basic value of the distribution function that after 50% of the operating time, 50% of the capacity requirement should be loaded.

Therefore, with a distribution on the basis of the operating time, 50% of the capacity requirements must be loaded after 40 hours of operating time, that is, on the sixth working day after 6 hours of operating time. On the first working day, the system loads 2.5% of the capacity requirement; and 10% on each day from the second to the fifth working day. On the sixth working day, 7.5% are loaded, plus a proportion that comes from the next basic value of the distribution.

Activities

You define distributions, for example, in Customizing for Capacity Planning by choosing Operations ® Capacity requirements. They are identified using distribution keys.

You enter distribution keys:

In the options profile for the capacity evaluation

In the evaluation profile for capacity leveling and the extended evaluation

You can also specify in the profiles that the system uses the distribution key that you enter in the capacities for the work center or in the operations/activities in networks, maintenance orders and process orders.

If you do not specify a distribution key, the system uses the distribution key SAP000. With this distribution key, all of the capacity requirements for an operation are loaded on the start day for the operation.

During the capacity evaluation, you can specify by choosing Settings ® General that the distribution keys are to be taken from the capacities or from the operations/activities in networks, process orders and maintenance orders.