How To Fix WER_CUST007 - Class &1 doesn't implement interface &2.

SAP Error Message - Details

• Message type: E = Error

• Message class: WER_CUST -

• Message number: 007

• Message text: Class &1 doesn't implement interface &2.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WER_CUST007 - Class &1 doesn't implement interface &2. ?

  The SAP error message:
  WER_CUST007 Class &1 doesn't implement interface &2.
  
  Cause:
  This error occurs when a class is expected to implement a particular interface but does not. In SAP ABAP Object-Oriented programming, interfaces define a set of methods that a class must implement. If a class is assigned or used in a context where it must implement a specific interface, but it does not, this error is raised.
  For example, if a program or configuration expects a class to implement interface IF_SOME_INTERFACE, but the class ZCL_SOME_CLASS does not implement it, the system throws this error.
  
  When does it typically occur?
  
  During runtime when an object reference is assigned or cast to an interface type.
  When configuring or customizing components that require classes to implement certain interfaces.
  In enhancement or BAdI implementations where the implementing class must implement a specific interface.
  During dynamic object creation or factory patterns where interface compliance is checked.
  
  
  Solution:
  
  
  Check the class definition:
  
  Go to the class &1 (the class name given in the error).
  Verify if it implements the interface &2 (the interface name given in the error).
  You can check this in SE24 (Class Builder) under the "Interfaces" tab.
  
  
  
  Implement the interface:
  
  If the class does not implement the interface, and it is required, add the interface to the class.
  Implement all the methods defined in the interface in the class.
  
  
  
  Adjust the code or configuration:
  
  If the class is not supposed to implement the interface, then check why the system expects it.
  Correct the assignment or configuration to use a class that implements the interface.
  Alternatively, change the interface or class references to match the actual implementation.
  
  
  
  Check for typos or incorrect class/interface names:
  
  Sometimes the error is due to a wrong class or interface name being used.
  
  
  
  
  Related Information:
  
  Transaction SE24: Class Builder to check and modify class and interface implementations.
  Transaction SE80: Object Navigator to explore classes and interfaces.
  ABAP Documentation: For understanding interfaces and class implementation.
  BAdI Implementations: Often require classes to implement specific interfaces.
  Dynamic Casting: When using CAST or TRY_CAST in ABAP, the class must implement the interface.
  
  
  Example:
  If you have:
  DATA: ref TYPE REF TO if_some_interface.
  CREATE OBJECT ref TYPE zcl_some_class.
  If zcl_some_class does not implement if_some_interface, the system will raise this error.
  To fix:
  
  Go to zcl_some_class in SE24.
  Add if_some_interface to the list of implemented interfaces.
  Implement all required methods.
  
  
  If you provide the exact class and interface names, I can help you with more specific instructions.