How To Fix QT418 - User fields will deviate if changed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 418

• Message text: User fields will deviate if changed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message QT418 - User fields will deviate if changed ?

  The SAP error message QT418 ("User fields will deviate if changed") typically occurs in the context of SAP's Quality Management (QM) module, particularly when dealing with inspection lots and quality notifications. This message indicates that there is a potential inconsistency or conflict between user-defined fields (custom fields) and the standard data in the system.
  Cause:
  The error arises when there is an attempt to change user-defined fields in a way that would lead to a deviation from the expected or standard values. This can happen in various scenarios, such as:
  
  Modification of Inspection Lot Data: If you are trying to change user-defined fields in an inspection lot that has already been processed or has existing data.
  Inconsistent Data: If the user fields are not aligned with the standard data or if there are dependencies that are not being respected.
  Custom Development: If there are custom developments or enhancements that are not properly handling the user fields.
  
  Solution:
  To resolve the QT418 error, consider the following steps:
  
  Review Changes: Check the changes you are trying to make to the user fields. Ensure that they are valid and do not conflict with existing data.
  Data Consistency: Ensure that the data in the user fields is consistent with the standard SAP data. If necessary, revert any changes that lead to inconsistencies.
  Check Dependencies: If there are dependencies between user fields and standard fields, ensure that these are respected when making changes.
  Consult Documentation: Review any documentation related to the custom fields and their intended use. This may provide insights into how changes should be handled.
  SAP Notes: Check for any relevant SAP Notes that may address this issue. SAP frequently releases notes that provide fixes or workarounds for known issues.
  Testing: If you are working in a development or test environment, try to replicate the issue and test different scenarios to identify the root cause.
  Consult with SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the QM module to understand how user fields are managed and any specific guidelines for their use.
  User Exits and BAdIs: If you have custom developments, check if there are user exits or BAdIs (Business Add-Ins) that might be affecting the behavior of user fields.
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP QM, such as QA01 (Create Inspection Lot), QA02 (Change Inspection Lot), and QA03 (Display Inspection Lot), to better understand where the error might be occurring.
  
  By following these steps, you should be able to identify the cause of the QT418 error and implement a suitable solution.