How To Fix WOD1028 - Unit of measure &1 is not an allowed order unit

SAP Error Message - Details

• Message type: E = Error

• Message class: WOD1 - Messages for Function Group WOD1

• Message number: 028

• Message text: Unit of measure &1 is not an allowed order unit

Self-Explanatory Message

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• What is the cause and solution for SAP error message WOD1028 - Unit of measure &1 is not an allowed order unit ?

  SAP Error Message:
  
  WOD1028 - Unit of measure &1 is not an allowed order unit
  
  Cause:
  This error occurs when you try to create or process a sales order (or related document) using a unit of measure (UoM) that is not permitted as an order unit for the material in question. In SAP, each material has specific allowed units of measure for ordering, delivery, and billing. If the UoM entered in the sales order is not defined or allowed as an order unit for that material, the system throws this error.
  
  Explanation:
  
  The system checks the unit of measure entered against the allowed order units maintained in the material master.
  The allowed order units are typically maintained in the Sales: Sales Org. 2 view of the material master (transaction MM02).
  If the UoM is not listed or not flagged as an allowed order unit, the system rejects it.
  
  
  Solution:
  
  
  Check the Material Master:
  
  Go to transaction MM03 (Display Material).
  Enter the material number.
  Navigate to the Sales: Sales Org. 2 view.
  Check the field Order Unit or the list of allowed order units.
  
  
  
  Maintain Allowed Order Units:
  
  If the UoM you want to use is not allowed, you need to add it.
  Use transaction MM02 (Change Material).
  Go to the Sales: Sales Org. 2 view.
  Add the required unit of measure as an allowed order unit.
  Save the changes.
  
  
  
  Check UoM Conversion:
  
  Ensure that the unit of measure you want to use has a valid conversion factor to the base unit of measure.
  This is maintained in the Units of Measure tab in the material master.
  
  
  
  Check Sales Document:
  
  When creating the sales order, use only the allowed order units.
  If a custom UoM is required, ensure it is properly maintained and allowed.
  
  
  
  
  Additional Information:
  
  Transaction Codes:
  
  MM02 - Change Material Master
  MM03 - Display Material Master
  VA01 - Create Sales Order
  
  
  Tables:
  
  MARA - General Material Data
  MVKE - Sales Data for Material
  T006 - Units of Measure
  
  
  Notes:
  
  Sometimes, the error can also occur if the UoM is not defined at all in the system (missing in T006).
  Check if the UoM is active and valid in your SAP system.
  If you are using variant configuration or special sales processes, ensure that the UoM is consistent across all related configurations.
  
  
  
  
  Summary:
  
  Cause: The unit of measure entered is not allowed as an order unit for the material.
  Solution: Add the UoM as an allowed order unit in the material master (Sales: Sales Org. 2 view).
  Check: UoM definitions, conversions, and consistency in sales documents.
  
  
  If you need further assistance, please provide the material number, sales organization, and the UoM you are trying to use.