How To Fix 28039 - Alphanumeric expression required

28039 - Overview

• Message type: E = Error

• Message class: 28 - Configuration

• Message number: 039

• Message text: Alphanumeric expression required

What causes this issue?

The syntax check found an error.

System Response

The cursor marks the place in your entry where the error occurs.

How to fix this error?

The system expects an alphanumeric expression at this point: either a
characteristic of character (CHAR) format or a character string in
inverted commas.

Error message extract from SAP system. Copyright SAP SE.

28039 - Details

• The SAP error message 28039, which states "Alphanumeric expression required," typically occurs when a program or function module expects an alphanumeric input but receives a different data type, such as numeric or binary data. This can happen in various contexts, such as when processing data in ABAP programs, function modules, or during data entry in transactions.
  
  Cause:
  
  Data Type Mismatch: The most common cause is that the input provided does not match the expected data type. For example, if a field is defined to accept alphanumeric characters but receives a numeric value, this error will be triggered.
  Incorrect Field Length: If the length of the input exceeds the defined length for the alphanumeric field, it can also lead to this error.
  Improper Data Conversion: If there is an attempt to convert data types without proper handling, it may lead to this error.
  
  
  Solution:
  
  Check Input Data: Ensure that the data being passed to the function or