How To Fix CME_DTYPE021 - You cannot shorten the length

SAP Error Message - Details

• Message type: E = Error

• Message class: CME_DTYPE - CME Data Type: Checks

• Message number: 021

• Message text: You cannot shorten the length

What causes this issue?

The data type has versions - higher versions must remain compatible
with lower versions.

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?

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 CME_DTYPE021 - You cannot shorten the length ?

  The SAP error message CME_DTYPE021 with the description "You cannot shorten the length" typically occurs when you are trying to change the length of a data element or field in a way that is not allowed by the system. This can happen in various contexts, such as when modifying database tables, structures, or data elements in the ABAP Dictionary.
  Cause:
  
  Data Type Constraints: The field you are trying to modify has existing data that exceeds the new length you are trying to set. SAP does not allow you to shorten the length of a field if it would result in data loss.
  Dependencies: Other objects (like tables, views, or programs) may depend on the current length of the field, and changing it could lead to inconsistencies.
  Database Constraints: The underlying database may have constraints that prevent the modification of the field length.
  
  Solution:
  
  
  Check Existing Data: Before attempting to shorten the length of a field, check the existing data in the database to ensure that no entries exceed the new length you want to set. You can use SQL queries or transaction codes like SE11 or SE16 to inspect the data.
  
  
  Data Migration: If there are existing records that exceed the new length, you may need to either truncate the data or migrate it to a new field with the desired length. This can involve creating a new field, copying the data over, and then dropping the old field.
  
  
  Adjust Dependencies: Review any dependent objects (like programs, reports, or other database objects) that may be affected by the change. You may need to adjust these objects accordingly.
  
  
  Use the Data Element: If you are working with a data element, consider whether you can create a new data element with the desired length instead of modifying the existing one.
  
  
  Consult Documentation: Refer to SAP documentation or consult with your SAP Basis or ABAP team for best practices on modifying data structures.
  
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), or SE16 (Data Browser) to analyze and manage data structures.
  SAP Notes: Check SAP Notes for any specific guidance or known issues related to this error message.
  Testing: Always test changes in a development or quality assurance environment before applying them to production to avoid data loss or application errors.
  
  By following these steps, you should be able to resolve the CME_DTYPE021 error and successfully manage the data structure changes in your SAP system.