How To Fix EFH009 - Field &1 will not be changed directly; it might be changed by inheritance

SAP Error Message - Details

• Message type: E = Error

• Message class: EFH - Equipment Functional Location Heal

• Message number: 009

• Message text: Field &1 will not be changed directly; it might be changed by inheritance

What causes this issue?

This field will not be changed because its data origin is set to
<LS>Superordinate Equipment</> or <LS>Functional Location</>. However,
the field may be changed due to inheritance if the superior object has
been selected for mass changes.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

If you want to change the data origin of the field to <LS>Maintained
Individually</>, open the equipment master data screen and change the
value of the field directly by choosing <LS>Edit </>-> <LS>Data origin
list</>.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message EFH009 - Field &1 will not be changed directly; it might be changed by inheritance ?

  The SAP error message EFH009 indicates that you are trying to change a field directly in a context where it is not allowed because the field is subject to inheritance. This typically occurs in scenarios involving object-oriented programming in ABAP, particularly when dealing with class attributes or fields that are inherited from a superclass.
  Cause:
  
  Inheritance Mechanism: The field you are trying to modify is inherited from a parent class or interface. In object-oriented programming, certain fields are designed to be read-only in subclasses to maintain encapsulation and integrity of the data.
  Field Attributes: The field may have been defined with specific attributes that prevent direct modification, such as being marked as READ-ONLY or being part of a protected or private section in the parent class.
  
  Solution:
  
  Use Setter Methods: Instead of trying to change the field directly, use the appropriate setter method provided by the class. This method is designed to handle changes to the field while respecting the rules of inheritance.
  Check Class Definition: Review the class definition of the parent class to understand how the field is intended to be used. Look for any methods that allow modification of the field.
  Override Methods: If you need to change the behavior of the inherited field, consider overriding the relevant methods in the subclass, if applicable.
  Consult Documentation: Refer to the SAP documentation or the class documentation to understand the intended use of the field and any constraints associated with it.
  
  Related Information:
  
  Object-Oriented Programming in ABAP: Understanding the principles of inheritance, encapsulation, and polymorphism in ABAP can help you navigate issues related to field access and modification.
  SAP Community and Forums: Engaging with the SAP community can provide insights and solutions from other developers who may have encountered similar issues.
  Debugging: Use the ABAP debugger to trace the execution and see where the error occurs, which can provide context on how the field is being accessed.
  
  By following these steps, you should be able to resolve the EFH009 error and modify your code accordingly.