How To Fix QP638 - Expand class width

SAP Error Message - Details

• Message type: E = Error

• Message class: QP - Message IDs for function module group QPAA

• Message number: 638

• Message text: Expand class width

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message QP638 - Expand class width ?

  The SAP error message QP638, which states "Expand class width," typically occurs in the context of quality management (QM) when dealing with inspection characteristics and their specifications. This error indicates that the class width defined for a characteristic is too narrow to accommodate the data being processed.
  Cause:
  The error is usually triggered when:
  
  The defined class width for a characteristic is smaller than the range of values that the characteristic can take.
  The inspection lot or the data being evaluated falls outside the defined limits of the class width.
  There may be a mismatch between the expected data and the defined specifications in the quality management settings.
  
  Solution:
  To resolve the QP638 error, you can take the following steps:
  
  
  Review Class Width Settings:
  
  Go to the inspection characteristic settings in the Quality Management module.
  Check the class width defined for the characteristic in question. Ensure that it is wide enough to encompass all possible values that may be recorded.
  
  
  
  Adjust Class Width:
  
  If the class width is too narrow, increase it to accommodate the range of expected values. This can be done in the configuration settings for the inspection characteristics.
  
  
  
  Check Inspection Lot Data:
  
  Review the data associated with the inspection lot. Ensure that the values being recorded do not exceed the defined limits of the class width.
  
  
  
  Re-evaluate Specifications:
  
  If necessary, re-evaluate the specifications for the inspection characteristics to ensure they align with the actual process capabilities and quality requirements.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidance on configuring inspection characteristics and class widths.
  
  
  
  Testing:
  
  After making adjustments, test the changes by creating a new inspection lot or reprocessing the existing one to see if the error persists.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like QCC1 (Create Inspection Characteristic) or QCC2 (Change Inspection Characteristic) to modify the characteristics.
  Quality Management Configuration: Familiarize yourself with the configuration settings in the Quality Management module, particularly those related to inspection plans and characteristics.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in Quality Management for further assistance.