How To Fix FL039 - Flat types may only be referenced using LIKE for table parameters

FL039 - Overview

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 039

• Message text: Flat types may only be referenced using LIKE for table parameters

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FL039 - Flat types may only be referenced using LIKE for table parameters ?

  The SAP error message FL039 indicates that there is an issue with how flat types are being referenced in your ABAP code, specifically when dealing with table parameters. This error typically arises when you attempt to use a flat type directly in a context where only a reference using the LIKE keyword is allowed.
  
  Cause:
  The error occurs because flat types (which are essentially structures or data types defined in ABAP) cannot be used directly as table parameters in certain contexts. Instead, you must reference them using the LIKE keyword to ensure that the system understands the relationship between the flat type and the table parameter.
  
  Solution:
  To resolve this error, you should modify your ABAP code to use the LIKE keyword when defining table parameters that reference flat types. Here’s how you can do it:
  
  
  Define the Flat Type: Ensure that you have defined your flat type correctly. For example:
  TYPES: BEGIN OF ty_flat,