How To Fix QT421 - A sample number already exists for the given key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: QT - QM: Inspection during production (with inspection points)

• Message number: 421

• Message text: A sample number already exists for the given key fields

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message QT421 - A sample number already exists for the given key fields ?

  The SAP error message QT421 indicates that a sample number already exists for the given key fields in the Quality Management (QM) module. This typically occurs when you are trying to create a new sample or inspection lot, but the system finds that a sample number with the same key fields already exists in the database.
  Cause:
  
  Duplicate Sample Number: The most common cause is that the sample number you are trying to create already exists in the system for the same combination of key fields (e.g., material number, plant, inspection type, etc.).
  Incorrect Data Entry: There may be a mistake in the data entry, leading to an attempt to create a sample that conflicts with existing records.
  System Configuration: The configuration settings in the QM module may not be set up to allow for multiple samples with the same key fields.
  
  Solution:
  
  Check Existing Samples: Before creating a new sample, check the existing samples in the system. You can do this by using transaction codes like QA32 (for inspection lots) or QA11 (for recording results) to see if a sample with the same key fields already exists.
  Use Different Key Fields: If you need to create a new sample, consider using different key fields that do not conflict with existing samples.
  Review Data Entry: Ensure that the data you are entering is correct and does not inadvertently match an existing sample.
  Consult Configuration: If you believe that the system should allow for multiple samples, consult with your SAP QM configuration team to review the settings related to sample management.
  Error Handling: If you are developing or customizing SAP applications, implement error handling to manage this situation gracefully, providing users with clear guidance on how to resolve the issue.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes in the QM module, such as:
  
  QA01 - Create Inspection Lot
  QA02 - Change Inspection Lot
  QA03 - Display Inspection Lot
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Review SAP documentation on Quality Management and sample management for best practices and guidelines.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant specializing in the QM module for further assistance.