How To Fix SCWN256 - Data type changed: from &1 to &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SCWN - Messages Note installation and management

• Message number: 256

• Message text: Data type changed: from &1 to &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SCWN256 - Data type changed: from &1 to &2 ?

  The SAP error message SCWN256 indicates that there has been a change in the data type of a field in a structure or table. Specifically, it states that the data type has changed from one type (denoted as &1) to another type (denoted as &2). This can occur during various operations, such as when you are working with data dictionary objects, transport requests, or during system upgrades.
  Cause:
  
  
  Data Dictionary Changes: The most common cause of this error is that the data type of a field in a database table or structure has been modified. This could happen due to:
  
  Changes made by a developer or during a transport of changes.
  An upgrade of the SAP system where the data types of certain fields have been altered.
  Changes in the underlying database schema.
  
  
  
  Inconsistent Data Types: If there are inconsistencies in the data types between different components of the system (e.g., between the ABAP program and the database), this error can occur.
  
  
  Solution:
  
  
  Check Data Dictionary: Review the data dictionary (SE11) for the affected table or structure. Verify the data types of the fields and ensure they are consistent with what is expected in your program or function module.
  
  
  Adjust ABAP Code: If you have ABAP code that references the affected field, you may need to adjust the data type in your code to match the new data type defined in the data dictionary.
  
  
  Transport Requests: If this error arises after a transport, ensure that all related objects have been transported correctly. Sometimes, missing transports can lead to inconsistencies.
  
  
  Recompile Objects: After making changes, recompile any affected programs, function modules, or classes to ensure they are in sync with the data dictionary.
  
  
  Check for Dependencies: If the field is used in multiple places (e.g., in views, other tables, or programs), ensure that all dependencies are updated to reflect the new data type.
  
  
  Consult Documentation: If this error occurred after an upgrade, consult the upgrade documentation provided by SAP to understand any changes made to data types.
  
  
  Related Information:
  
  Transaction Codes: Use SE11 (Data Dictionary), SE80 (Object Navigator), and SE37 (Function Module) to investigate and modify the relevant objects.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Debugging: If necessary, use the ABAP debugger to trace where the error occurs in the code and identify the specific field causing the issue.
  
  By following these steps, you should be able to resolve the SCWN256 error and ensure that your SAP system operates smoothly.