How To Fix OO180 - Interface &1 is already included in interface &2

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 180

• Message text: Interface &1 is already included in interface &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO180 - Interface &1 is already included in interface &2 ?

  The SAP error message OO180, which states "Interface &1 is already included in interface &2," typically occurs when you are trying to include an interface in another interface that has already been included. This is a common issue in ABAP Object-Oriented programming when dealing with interfaces.
  Cause:
  The error arises due to the following reasons:
  
  Redundant Inclusion: You are attempting to include an interface that has already been included in the target interface. In SAP, an interface can only be included once in another interface to avoid ambiguity and redundancy.
  Circular References: If there are circular references where interfaces include each other, it can lead to this error.
  
  Solution:
  To resolve the OO180 error, you can take the following steps:
  
  
  Check Interface Inclusions:
  
  Go to the interface definition of the target interface (interface &2).
  Check the list of included interfaces to see if interface &1 is already included.
  If it is included, you do not need to include it again.
  
  
  
  Remove Redundant Inclusion:
  
  If you find that interface &1 is already included, remove the redundant inclusion from the interface where you are trying to add it.
  
  
  
  Review Interface Design:
  
  If you are facing circular references, consider redesigning your interfaces to avoid such situations. This may involve creating a new interface that consolidates the methods or attributes needed by the interfaces involved.
  
  
  
  Use Interface Hierarchies:
  
  If you have multiple interfaces that share common methods, consider using interface hierarchies to manage inclusions more effectively.
  
  
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE80 (Object Navigator) or SE11 (Data Dictionary) to navigate and manage interfaces.
  Documentation: Refer to the SAP Help Portal or ABAP documentation for best practices on interface design and object-oriented programming in ABAP.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues or enhancements related to interface handling.
  
  By following these steps, you should be able to resolve the OO180 error and ensure that your interface design is clean and efficient.