How To Fix STREX004 - Only fields of type char or String are allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: STREX - Message for TREX ABAP Client

• Message number: 004

• Message text: Only fields of type char or String are allowed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message STREX004 - Only fields of type char or String are allowed ?

  The SAP error message STREX004 indicates that there is an issue with the data type of a field being used in a certain operation, typically related to string manipulation or processing. This error occurs when a field that is not of type char or string is being used in a context where only these types are allowed.
  Cause:
  
  Incorrect Data Type: The most common cause of this error is that a field being processed is of a different data type (e.g., numeric, date, etc.) instead of char or string.
  Function Module or Method Restrictions: Certain function modules or methods in ABAP require input parameters to be of specific types. If the input does not meet these requirements, the error will be triggered.
  Data Structure Issues: If you are working with a structure or table that contains fields of various types, and you attempt to manipulate a non-character field as if it were a character field, this error will occur.
  
  Solution:
  
  Check Data Types: Review the data types of the fields being used in the operation that triggered the error. Ensure that they are of type char or string.
  Type Conversion: If you need to use a non-character field, consider converting it to a character type using appropriate conversion functions (e.g., CONCATENATE, WRITE, or STRING functions).
  Modify the Code: If the error occurs in a specific piece of code, modify it to ensure that only character or string fields are being processed. This may involve changing the logic or the way data is being passed to functions or methods.
  Debugging: Use the ABAP debugger to step through the code and identify the exact point where the error occurs. This can help you understand which field is causing the issue.
  
  Related Information:
  
  ABAP Data Types: Familiarize yourself with the different data types in ABAP, especially char, string, and how they are used in string operations.
  Function Module Documentation: Check the documentation for any function modules or methods you are using to understand their parameter requirements.
  SAP Notes: Look for any relevant SAP Notes that might address this error or provide additional context or solutions.
  
  By following these steps, you should be able to identify the cause of the STREX004 error and implement a solution to resolve it.