How To Fix TR155 - Key contains field with lowercase letters

SAP Error Message - Details

• Message type: E = Error

• Message class: TR - Change and Transport System

• Message number: 155

• Message text: Key contains field with lowercase letters

What causes this issue?

The key of the selected table contains one or more fields that
allow lower-case characters. Entry in this fast-entry screen
is not possible.

System Response

Keys that have already been entered are displayed.

How to fix this error?

Branch to the key maintenance screen, where you can enter
each key field individually.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TR155 - Key contains field with lowercase letters ?

  The SAP error message TR155, which states "Key contains field with lowercase letters," typically occurs when you are trying to create or modify a transport request or a transport object in SAP, and the key (which may refer to the name of a transport object, such as a table, function module, or other repository objects) contains lowercase letters. In SAP, certain naming conventions are enforced, and keys are expected to follow specific rules.
  Cause:
  The primary cause of this error is that SAP requires certain keys (like transport request names, object names, etc.) to be in uppercase letters. If any part of the key contains lowercase letters, the system will throw this error to maintain consistency and adhere to naming conventions.
  Solution:
  To resolve this error, you should ensure that all parts of the key you are trying to use are in uppercase. Here are the steps you can take:
  
  
  Check the Naming Convention: Review the naming conventions for the specific object you are working with. Ensure that all identifiers (like names of tables, function modules, etc.) are in uppercase.
  
  
  Modify the Key: If you have control over the naming of the object or transport request, change any lowercase letters to uppercase. For example, if you have a key like myObject, change it to MYOBJECT.
  
  
  Review Transport Request: If the error occurs while creating or modifying a transport request, check the request name and ensure it adheres to the uppercase requirement.
  
  
  Use Transaction Codes: If you are using transaction codes to create or manage transport requests, ensure that you are following the correct procedures and naming conventions.
  
  
  Consult Documentation: If you are unsure about the naming conventions for specific objects, refer to SAP documentation or guidelines related to the specific module or object type you are working with.
  
  
  Related Information:
  
  SAP Naming Conventions: Familiarize yourself with SAP's naming conventions for various objects. This can help prevent similar errors in the future.
  Transport Management System (TMS): Understanding how the Transport Management System works in SAP can provide insights into how transport requests are structured and managed.
  SAP Notes: Check for any relevant SAP Notes that may provide additional context or solutions related to this error message.
  
  By following these steps and ensuring compliance with SAP's naming conventions, you should be able to resolve the TR155 error effectively.