How To Fix WT128 - Enter a requirement group

SAP Error Message - Details

• Message type: E = Error

• Message class: WT - Retail: Replenishment

• Message number: 128

• Message text: Enter a requirement group

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WT128 - Enter a requirement group ?

  SAP Error Message:
  
  WT128 - Enter a requirement group
  
  Cause:
  The error message WT128 occurs when you are trying to create or process a work center or routing operation in SAP, and the system requires you to enter a Requirement Group but it has not been provided.
  A Requirement Group is used in SAP Production Planning (PP) to group operations or activities that share the same scheduling or capacity requirements. It helps in capacity planning and scheduling by defining how operations consume capacity on work centers.
  The system expects a requirement group to be entered because the work center or routing operation is set up to require it for capacity planning or scheduling purposes.
  
  When does this error typically occur?
  
  When creating or changing routing operations.
  When entering or maintaining work centers.
  When the work center or operation is configured to require a requirement group but none is entered.
  During capacity planning or scheduling where requirement groups are mandatory.
  
  
  Solution:
  
  
  Enter a Requirement Group:
  
  In the routing operation or work center screen, enter a valid Requirement Group in the relevant field.
  Requirement groups are usually defined in Customizing under Capacity Planning.
  
  
  
  Check Work Center Settings:
  
  Go to the work center master data (transaction CR01/CR02/CR03).
  Check the Capacity tab and verify if the requirement group is mandatory.
  If the requirement group is mandatory, ensure it is entered.
  
  
  
  Define Requirement Groups (if not existing):
  
  If no requirement groups exist or the required one is missing, define them in Customizing:
  
  SPRO ? Production ? Capacity Planning ? Work Center ? Define Requirement Groups.
  
  
  Create or maintain requirement groups as per your planning needs.
  
  
  
  Adjust Routing Operation:
  
  In the routing operation, enter the requirement group in the Requirement Group field.
  This links the operation to the capacity requirements defined by the group.
  
  
  
  Check Configuration:
  
  If the requirement group is not supposed to be mandatory, check the configuration of the work center and routing to ensure that the requirement group field is not set as mandatory incorrectly.
  
  
  
  
  Additional Information:
  
  Requirement Groups are used to group similar capacity requirements for scheduling and capacity leveling.
  They help in defining how operations consume capacity on work centers.
  If you do not use capacity planning or scheduling, you might not need to enter requirement groups.
  This error ensures data consistency for capacity planning and scheduling processes.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error Message
  WT128 - Enter a requirement group
  
  
  Cause
  Requirement group field is empty but mandatory for the work center or routing operation
  
  
  Solution
  Enter a valid requirement group in the routing operation or work center master data
  
  
  Where to Define
  SPRO ? Production ? Capacity Planning ? Work Center ? Define Requirement Groups
  
  
  
  
  If you need help with the exact screen or transaction, please provide more context (e.g., transaction code, process step).