How To Fix GB104 - Rule & is already assigned to a different validation class

SAP Error Message - Details

• Message type: E = Error

• Message class: GB - Messages used by the Boolean code generator

• Message number: 104

• Message text: Rule & is already assigned to a different validation class

What causes this issue?

A subrule exists with this name but it is a different type to the one
that you are using.

System Response

None.

How to fix this error?

Create a new subrule with a new name.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GB104 - Rule & is already assigned to a different validation class ?

  The SAP error message GB104 indicates that a specific rule (in this case, a validation rule) is already assigned to a different validation class. This typically occurs in the context of SAP's validation and substitution functionality, which is used to ensure data integrity and consistency in financial documents.
  Cause:
  
  Duplicate Assignment: The rule you are trying to assign is already linked to another validation class. In SAP, each validation rule can only be assigned to one validation class at a time.
  Configuration Error: There may be a misconfiguration in the validation rules or classes, leading to conflicts.
  System Migration or Changes: If there have been recent changes or migrations in the system, it could lead to inconsistencies in rule assignments.
  
  Solution:
  
  
  Check Existing Assignments: 
  
  Go to the transaction code for validation (e.g., OB28 for validation rules).
  Look for the rule in question and check which validation class it is currently assigned to.
  
  
  
  Reassign the Rule:
  
  If you need to assign the rule to a different validation class, you will first need to remove it from the current class.
  After removing it, you can then assign it to the desired validation class.
  
  
  
  Review Configuration:
  
  Ensure that the validation rules and classes are configured correctly and that there are no unintended overlaps.
  If necessary, consult with your SAP configuration team to review the setup.
  
  
  
  Documentation and Notes:
  
  Check SAP Notes for any known issues or updates related to validation rules and classes. Sometimes, there may be patches or updates that address specific issues.
  
  
  
  Testing:
  
  After making changes, conduct thorough testing to ensure that the validation rules are functioning as expected without causing further conflicts.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  OB28: For maintaining validation rules.
  OB29: For maintaining substitution rules.
  
  
  
  SAP Documentation: Refer to the official SAP Help Portal for detailed documentation on validation and substitution rules.
  
  
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  
  
  By following these steps, you should be able to resolve the GB104 error and ensure that your validation rules are correctly assigned and functioning as intended.