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 Define Parameters for PP/DS Bucket Capacity

Use

The PP/DS bucketsof a resource form the basis for the bucket-oriented capacity check. Therefore, you should only maintain the parameters for the PP/DS bucket capacity for resources that have a critical available capacity.

Integration

You can also maintain the parameters for the PP/DS bucket capacity in the R/3 system in the corresponding work center and then transfer the changed work center data to the SAP APO system using the APO Core Interface (CIF).

Prerequisites

  • You can only create parameters for the PP/DS bucket capacity for the following resource types :

    • Single-activity resource

    • Single-mixed resource

    • Multiactivity resource (created without dimensions)

    • Multimixed resource (created without dimensions)

  • You have set the Finite Planning indicator on the General Data tab page.

  • You have defined the parameters for the time-continuous capacity .

Features

You create PP/DS buckets by defining the parameters for the PP/DS bucket capacityand then saving your entries on the PP/DS Bucket Cap . tab page.

Bucket Definition

For the CTP check, choose the setting From Time-Continuous Capacity in the field Bucket Definition . With this setting, the available capacity of the PP/DS bucket is derived from the available capacity of the time-continuous capacity of the resource.

Bucket schema

You can define the size and start time of the PP/DS bucket in the Bucket Schema field. The extent of a bucket is determined by the period that you specify. For example, if you specify day for the bucket schema, then the available capacity of a bucket refers to one day. If you specify a week , the available capacity of a bucket refers to a week. The individual buckets are always the same length.

If you want to use periods that you have defined yourself, you can change the given periods by using the BAdI /SAPAPO/CRESBUCKET.

Example Example

In resource maintenance you enter a period, for example, a day. A bucket then covers exactly one day. Using the BAdI, you can then change the specified bucket, for example, by grouping two days in one bucket.

End of the example.

The choice of a suitable bucket size depends on various factors, for example:

  • Average order size

    The bucket size should be large enough that even an operation of a large planned order can be carried out within a bucket. Alternatively, you can define the maximum lot size in the product master record so that all operations can be carried out within a bucket.

  • Required quality of information

    The quality of information is inversely proportional to the bucket size. This means that the quality of information deteriorates as the bucket size increases. Therefore, the quality of information is, for example, very low, if a sales order with a processing duration of one day lies within a bucket with a duration of one year.

Bucket factor %

The bucket factor is used to define the relationship between the available capacity of the time-continuous capacity and the bucket capacity.

The bucket factor is used to define the capacity reduction for the bucket capacity requirement of the sequence-dependent setup activity. See also: Taking Into Account Sequence-Dependent Setup Activities

Finite capacity

The field Finite Capacity determines whether the bucket or the time-continuous capacity of a resource should be scheduled finitely. However, the finite capacity setting in the strategy profile overrides the setting for the resource.

Activities

  • On the basis of the parameters that you have entered for the PP/DS bucket capacity, the system calculates the available capacity of a PP/DS bucket according to the following formulas:

    Bucket capacity of a single-activity resource = Productive time of the resource x Bucket factor

    Bucket capacity of a multi-activity resource = Productive time of the resource x Number of capacities x bucket factor

  • Using the function button Bucket Capacity on the PP/DS Bucket Capacity tab page, you can display the available capacity of the bucket. The system then generates a list of the available capacity in hours, for each bucket.

  • Using the function button Check Routings, on the PP/DS Bucket Capacity tab page, you can check the PPM/PDS for the resource. The resource must be used as the primary resource in the PPM/PDS and the calendar resource indicator must be set. Once it has checked the PPM/PDS, the system issues a list of routings in which the resource is used as a secondary resource, and/or where the Calendar Resource indicator has not been set. See also: Settings in PPM/PDS

Example

A resource has a time-continuous available capacity of 22 hours per day. You enter a bucket factor of 90% . You have defined a bucket schema of a day (start: 00:00) . The system now calculates the available capacity of the PP/DS bucket according to the following formula:

Time-continuous available capacity per day x Bucket factor = 22 hours x 0.90 = 19.8 hours

Therefore, the available capacity of a PP/DS buckets is 19.8 hours.