How To Fix DT176 - Derived LOB handle structure & must not reference any write class &

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 176

• Message text: Derived LOB handle structure & must not reference any write class &

What causes this issue?

This view is for read only. Therefore, in the derived LOB handle
structures, no classes with a write option must be referenced. However,
this was attempted here.

System Response

The view will not be activated.

How to fix this error?

,,The view must also be usable for the write function, or the referenced
class of the LOB handle structure must only be with the read option.
After the necessary adjustment, activate the view once again.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT176 - Derived LOB handle structure & must not reference any write class & ?

  The SAP error message DT176, which states "Derived LOB handle structure & must not reference any write class &," typically occurs in the context of handling Large Objects (LOBs) in ABAP programs. This error indicates that there is an issue with the way a derived LOB handle structure is defined or used in your ABAP code.
  Cause:
  
  LOB Handle Structure: The error arises when a derived LOB handle structure is incorrectly referencing a write class. In ABAP, LOBs (like BLOBs and CLOBs) are used to handle large data types, and the derived LOB handle structure should not have any references to classes that are intended for writing data.
  Incorrect Definition: The structure may have been defined in a way that it inherits properties or references from a class that is not suitable for LOB handling.
  Incompatibility: There may be an incompatibility between the LOB handle structure and the data types or classes being used.
  
  Solution:
  
  Review Structure Definition: Check the definition of the derived LOB handle structure. Ensure that it does not reference any write classes. The structure should only contain fields that are appropriate for LOB handling.
  Modify Class References: If the structure is referencing a write class, modify it to remove those references. Ensure that the structure is only using read-compatible classes or types.
  Use Standard LOB Types: If possible, use standard LOB types provided by SAP instead of creating custom structures. This can help avoid compatibility issues.
  Check for Updates: Ensure that your SAP system is up to date, as there may be patches or updates that address this issue.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for LOB handling in ABAP. This can provide insights into the correct usage and definitions of LOB structures.
  ABAP Development Guidelines: Review the ABAP development guidelines to ensure that your code adheres to best practices for handling LOBs.
  SAP Community: Engage with the SAP Community forums or support channels. Other developers may have encountered similar issues and can provide insights or solutions.
  
  If the problem persists after following these steps, consider reaching out to SAP support for further assistance, providing them with the specific context and code snippets related to the error.