How To Fix CRM_SERVICE_OS128 - To enable the serial number, specify a quantity of 1 and use a base unit.

SAP Error Message - Details

• Message type: E = Error

• Message class: CRM_SERVICE_OS - CRM Service: Subject Reference Object

• Message number: 128

• Message text: To enable the serial number, specify a quantity of 1 and use a base unit.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CRM_SERVICE_OS128 - To enable the serial number, specify a quantity of 1 and use a base unit. ?

  The SAP error message CRM_SERVICE_OS128 typically occurs in the context of service management or when dealing with materials that have serial numbers. This error indicates that the system requires a quantity of 1 for items that are serialized, and it also requires that a base unit of measure is specified.
  Cause:
  
  Quantity Issue: The error arises when you attempt to process a serialized item with a quantity greater than 1. In SAP, serialized items must be handled one at a time, meaning you can only specify a quantity of 1.
  Base Unit of Measure: The item may not have a base unit of measure defined, or the unit of measure being used is not compatible with the serial number management.
  
  Solution:
  To resolve the CRM_SERVICE_OS128 error, follow these steps:
  
  
  Set Quantity to 1: Ensure that when you are entering the serialized item, the quantity is set to 1. This is a requirement for items that are managed by serial numbers.
  
  
  Check Base Unit of Measure:
  
  Go to the material master record for the item in question.
  Ensure that the base unit of measure is defined correctly. You can do this by navigating to the relevant views in the material master (usually the Basic Data view).
  If the base unit of measure is not set, you will need to update it to a valid unit that is compatible with serial number management.
  
  
  
  Review Serial Number Management Settings: 
  
  Check if the material is set up for serial number management in the material master. This can be found in the "Sales" or "Plant Data" views.
  Ensure that the serial number profile is correctly assigned to the material.
  
  
  
  Test the Changes: After making the necessary adjustments, try to process the item again to see if the error persists.
  
  
  Related Information:
  
  SAP Documentation: Refer to the SAP Help Portal for detailed documentation on serial number management and material master data.
  Transaction Codes: You may need to use transaction codes like MM02 (Change Material) to update the material master or CRM transactions related to service orders.
  User Exits and BAdIs: If you are customizing the behavior of the system, check if there are any user exits or BAdIs that might be affecting how quantities and serial numbers are handled.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or refer to SAP Notes for any known issues related to this error message.