Wave Picks - SAP WM

Use
Using wave picks, you can perform detailed planning for picking by creating work packages for picking. Wave picks consist of a group deliveries that are to be processed at roughly the same time. You can create wave picks either manually or automatically according to time criteria.

Capacity restrictions can be taken into consideration when waves are formed according to time criteria. If the deliveries that are to be picked are already assigned to shipments, you can refer to these shipments when the wave picks are formed.

Integration
Wave picks are groups of deliveries that are identified by a number. You can execute the following Subsequent Functions for Wave Picks with reference to the wave pick for all deliveries in that wave:

  • Planning replenishment for fixed storage bins
  • Creating and printing transfer orders
  • Confirming transfer orders
  • 2-step picking
  • Creating and monitoring shipments
  • Printing delivery notes / freight lists
  • Posting goods issue
  • Creating and printing billing documents
  • You can track the processing status of the wave picks with the wave pick monitor. Wave picks do not influence the workload that is displayed in the Rough Workload Forecast.

Prerequisites
Lean WM is the minimum implementation requirement in order to work with wave picks and most of the following functions. Of course, you can also work with wave picks if you have implemented the full WM system.

You create the wave picks using exact time parameters. For this reason, exact scheduling (down to the minute) is necessary. However, you can work with wave picks without using such precise specifications if you have implemented the route schedule and are using the goods issue time as the comparison time. For tips on Customizing, refer to the IMG section on wave picks.

Activities
To create wave picks according to time criteria, you must first divide up the workday into smaller units using time slots. You can group these time slots together using the timeslot group.

The system carries out the following steps as it creates wave picks according to delivery time: Before the individual deliveries are assigned to wave picks, the deliveries due are sorted by:

  1. Date
  2. Time
  3. Delivery priority (field in the customer master)

Afterwards, the system assigns each delivery whose comparison time is in a time slot of a timeslot group to a wave pick that belongs to that time slot. In the case of wave picks with capacity restriction, this is done until the capacity limit is reached.

As a comparison time, the system selects the goods issue time set in Customizing for the respective warehouse/distribution center. If the following deliveries exist:

  • Delivery A (goods issue time 8:00)
  • Delivery B (goods issue time 8:00)
  • Delivery C (goods issue time 9:00)
  • Delivery D (goods issue time 9:30)
  • The selected timeslot group covers 2 time slots:

  • Time slot 1 (8:00 through 8:59), wave pick profile 1
  • Time slot 2 (9:00 through 9:59), wave pick profile 2
  • The system creates the following wave picks:

  • Wave pick 1 (8:00 through 8:59): deliveries A, B
  • Wave pick 2 (9:00 through 9:59): deliveries C, D

Wave Picks with Capacity Restrictions
Use
Capacity restrictions can only be taken into consideration if wave picks are set up according to time criteria (Create wave pick according to delivery time and Create wave picks according to shipment and compare times). When an individual capacity limit is reached, the capacity limit of a wave pick is reached. If you run this function in the background, the system only assigns as many deliveries to a wave as the capacity limit allows. In the foreground, deliveries that exceed one of these limits are highlighted in red.

Range of Functions
You can define the following capacity restrictions in Customizing:

  • Maximum number of delivery items relevant for picking in a wave pick
  • Maximum number of picking transactions in a wave pick
  • Article A: 150 Packing units
    Article B: 1 Pallet
    Article C: 5 Pieces
    Article D: 250 Packing units
    Number of picking transactions: 406

    In order to use these capacity restrictions, execute the following activities in the Implementation Guide (IMG):
    _ Maintain Unit-of-Measure Load Category
    _ Assign Units of Measure to Unit-of-Measure Load Category

  • Maximum number of packaging materials in a wave pick
  • Euro pallet: 10
    Large container on wheels: 250
    Small container on wheels: 15
    Amount of packaging material: 275

    In order to use these capacity restrictions, execute the following activities in the Implementation Guide (IMG):
    _ Define packaging material types
    _ Additional Data for Packaging Material and Time Slot

  • Maximum weight of the wave pick's delivery items relevant for picking
  • Maximum volume of the wave pick's delivery items relevant for picking
  • Maximum processing time for a wave pick in hours (planned workload)

In order to use these capacity restrictions, execute the IMG activities for workload calculation.

Creating Wave Picks - Delivery Time
Procedure
To create wave picks automatically according to time criteria, proceed as follows:

  1. From shipping, choose Picking Wave Picks Create According to delivery time. The Create/Change Wave Picks screen appears.
  2. Enter the number of the warehouse for which you want to create wave picks.
  3. Make the following entries in the Time frame section of the screen:
  4. _ Reference date
    All deliveries whose compare times correspond to this date are incorporated into wave creation for that day.
    _ Timeslot group
    You can combine various time slots by entering a timeslot group. You get a maximum of one wave pick per time slot.
    _ Time slot
    In addition to the timeslot group, specify a time slot if you only want to construct a wave pick for that particular time slot of the timeslot group.
    _ Surplus deliveries as of
    Deliveries that have not yet been assigned to a wave pick can be included when the waves are created. Enter the date as of which these deliveries should be incorporated.

  5. Choose a processing type:
  6. _ Display waves before saving (default)
    Choose this processing type if you want the waves to appear onscreen, if you want to edit them before saving or if you only want to run a simulation (in the foreground).
    _ Save waves directly
    Choose this processing type if you want to save the waves immediately without displaying them first (background processing).
    The system saves the waves without displaying them onscreen.

  7. In the Filter section of the screen, there are various selection criteria that you can use to choose specific deliveries that you want to combine into wave picks.
  8. Choose Program Execute.
  9. Depending on the processing type you chose, the result is as follows:
    • Display waves before saving
    • Save waves directly
      The system displays the numbers of the wave picks that have been saved in the database.
  10. Using the ABAP list viewer, the system displays one or more wave proposals onscreen. The following indicators appear as standard:
    • Green traffic light and check mark as save indicator Waves without capacity restrictions or waves with capacity restrictions that have not been exceeded. If you expand the wave, the corresponding deliveries will appear. All deliveries in this wave (except for surplus deliveries) have a green traffic light. The green check mark means they are flagged to be saved.
    • Red traffic light with no check mark as save indicator Waves with capacity restrictions that have been exceeded. If you expand the wave, the corresponding deliveries will appear.
    • Green traffic light and check mark as save indicator Deliveries that are not considered critical as far as capacity is concerned
    • Red traffic light with no check mark as save indicator Deliveries that are in the critical range for wave capacity Surplus deliveries are generally assigned to the first wave, which appears fully expanded on the screen. Surplus deliveries are marked with a stop sign.
  11. In response to a capacity crisis, you could process the waves that are displayed as follows:
    • Exclude waves before saving Get rid of the wave's check mark (saving indicator).
    • Delete deliveries from waves Expand the wave and delete the save check marks from the chosen deliveries. The system only saves those deliveries that are marked to be saved. This means that deliveries that have no check mark will not be saved, even if they are within a wave that is marked for saving.
    • Move deliveries among waves
  12. To move a delivery from a source wave to a target wave, proceed as follows:

    1. Click on the number of the delivery in the source wave that you want to move. The delivery is highlighted in yellow.
    2. Now click on the target wave. The delivery is moved from the source wave to the target wave, where it is marked with a plus sign.
  13. Save the wave picks
  14. The numbers of the wave picks that have been created appear on the screen. The system creates a log of the activities performed. To view the log, choose Wave Picks Log Wave Pick.

Processing Wave Picks

  1. To process wave picks, start at shipping and then choose Picking Wave Picks.
  2. Then, choose the respective menu path from the following table.
  3. Processing Wave Picks

Subsequent Functions for Wave Picks

  1. To execute functions subsequent to wave picks, start at shipping and then choose Picking Wave Picks Monitor.The Wave Pick Monitor screen appears.
  2. Enter the warehouse number and other selection criteria and choose Program Execute. The Wave Pick Monitor: List screen appears.
  3. Select the group of your choice and choose Subsequent functions _ followed by one of the following menu paths:
  4. Subsequent Functions for Wave PicksSubsequent Functions for Wave PicksSubsequent Functions for Wave Picks


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