How To Fix W+655 - Class type & not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: W+ -

• Message number: 655

• Message text: Class type & not defined

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message W+655 - Class type & not defined ?

  SAP Error Message:
  
  W+655 Class type & not defined
  
  Cause:
  This warning message occurs when the system tries to reference a class type that has not been defined or declared in the current ABAP program or environment. Essentially, the class type specified by the placeholder & (which will be replaced by the actual class name in the runtime message) is unknown to the system at the point where it is being used.
  Common scenarios include:
  
  The class has not been created or activated in the system.
  The class name is misspelled or incorrect.
  The class is defined in another package or namespace that is not properly referenced.
  The program or include where the class is used does not have the necessary CLASS or TYPE declarations.
  Missing or incorrect INCLUDE or TYPE statements that should bring the class definition into scope.
  
  
  Solution:
  
  
  Check Class Existence:
  
  Verify that the class mentioned in the error message actually exists in the system.
  Use transaction SE24 (Class Builder) to search for the class.
  If the class does not exist, create or import it as needed.
  
  
  
  Check Spelling and Naming:
  
  Ensure the class name is spelled correctly in the code.
  Pay attention to case sensitivity and namespace prefixes (e.g., /XYZ/CL_MY_CLASS).
  
  
  
  Activate the Class:
  
  If the class exists but is inactive, activate it in SE24.
  
  
  
  Include or Declare the Class Properly:
  
  Make sure the class is declared or referenced properly in the program.
  For example, if you are using the class as a type, declare it explicitly:
  DATA obj TYPE REF TO <class_name>.
  
  Or use CLASS <class_name> DEFINITION if defining a subclass or interface.
  
  
  
  Check Package and Transport Dependencies:
  
  If the class is in a different package or transport request, ensure it is imported and available in the current system/client.
  
  
  
  Check for Missing Includes or Type Pools:
  
  Sometimes, the class type is defined in an include or type pool that is not included in the program.
  
  
  
  
  Related Information:
  
  Message Class: W+655 indicates a warning message related to class types.
  Transaction SE24: Class Builder, used to create, display, and maintain classes.
  Transaction SE80: Object Navigator, useful for navigating and checking class definitions.
  ABAP Documentation: Refer to ABAP keyword documentation for CLASS, DATA, and TYPE statements.
  Namespace and Package Management: Ensure proper use of namespaces and package dependencies to avoid missing class definitions.
  
  
  Summary:
  The error W+655 Class type & not defined means the ABAP runtime cannot find the class type you are trying to use. Verify the class exists, is active, correctly spelled, and properly declared in your program. Correct these issues to resolve the warning.