How To Fix OO321 - Exception &1 &2 &3: Inconsistency in method &1 &2 (MTDTYPE)

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 321

• Message text: Exception &1 &2 &3: Inconsistency in method &1 &2 (MTDTYPE)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO321 - Exception &1 &2 &3: Inconsistency in method &1 &2 (MTDTYPE) ?

  The SAP error message OO321 indicates an inconsistency in a method related to the Object-Oriented programming model in ABAP. This error typically arises when there is a mismatch or inconsistency in the method definition or implementation in the class or interface.
  Cause:
  
  Inconsistent Method Signature: The method signature in the class does not match the signature defined in the interface or superclass.
  Missing Implementation: The method is declared but not implemented in the class.
  Changes in Class/Interface: If there have been recent changes to the class or interface, such as renaming or changing parameters, it can lead to inconsistencies.
  Transport Issues: If the class or method was transported from one system to another, it might not have been transported correctly, leading to inconsistencies.
  
  Solution:
  
  Check Method Signature: Verify that the method signature in the class matches the signature in the interface or superclass. Ensure that the parameters, return types, and exceptions are consistent.
  Implement Missing Methods: If the method is declared but not implemented, provide the necessary implementation in the class.
  Recheck Recent Changes: If there have been recent changes, review them to ensure that all modifications are consistent and correctly implemented.
  Transport Consistency: If the issue arose after a transport, check the transport logs and ensure that all related objects were transported correctly.
  Activate Objects: Sometimes, simply activating the class or interface can resolve the inconsistency. Go to the class or interface in the ABAP Workbench and activate it.
  Check for Syntax Errors: Ensure there are no syntax errors in the class or method implementation that could be causing the inconsistency.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE80 (Object Navigator) or SE24 (Class Builder) to navigate to the class or interface and check the method definitions.
  Debugging: If the error occurs during runtime, consider using the debugger to trace the execution and identify where the inconsistency arises.
  Documentation: Refer to SAP documentation or community forums for specific examples and additional troubleshooting steps related to OO programming in ABAP.
  
  If the problem persists after following these steps, consider reaching out to your SAP support team or consulting SAP Notes for more specific guidance related to your version of SAP.