How To Fix FL040 - Only table types may be used as the reference type for a table parameter

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 040

• Message text: Only table types may be used as the reference type for a table parameter

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FL040 - Only table types may be used as the reference type for a table parameter ?

  The SAP error message FL040 indicates that there is an issue with the definition of a table parameter in a function module or method. Specifically, it states that only table types can be used as the reference type for a table parameter. This error typically arises when you attempt to use a non-table type (like a structure or a simple data type) as the reference type for a table parameter.
  Cause:
  
  Incorrect Data Type: You may have defined a table parameter in a function module or method with a reference type that is not a table type. For example, using a structure or a scalar type (like CHAR, INT, etc.) instead of a table type.
  Parameter Definition: The parameter is defined incorrectly in the function interface. It should be defined as a table type, but it might be mistakenly defined as a different type.
  
  Solution:
  To resolve the FL040 error, follow these steps:
  
  
  Check Parameter Definition:
  
  Go to the function module or method where the error occurs.
  Check the definition of the table parameter. Ensure that it is defined with a reference type that is a table type.
  
  
  
  Use Table Types:
  
  If you are using a structure or a scalar type, change the reference type of the parameter to a table type. You can create a table type if it does not already exist.
  For example, if you have a structure Z_MY_STRUCTURE, you can create a table type Z_MY_STRUCTURE_TABLE based on that structure.
  
  
  
  Adjust Function Interface:
  
  If you are using a standard table type (like TABLE OF <type>), ensure that the parameter is defined correctly in the function interface.
  Make sure to use the correct syntax for defining the table parameter, such as TABLE OF <type> or TYPE REF TO <table type>.
  
  
  
  Activate Changes:
  
  After making the necessary changes, activate the function module or method to ensure that the changes take effect.
  
  
  
  Related Information:
  
  Table Types: In ABAP, table types are defined using the TYPES statement. You can define a table type based on a structure or another table type.
  Function Module Interface: When defining a function module, you can specify parameters in the interface section. Ensure that the types are correctly defined according to the expected input/output.
  ABAP Documentation: Refer to the official SAP documentation for more details on defining function modules and the correct usage of table parameters.
  
  By following these steps, you should be able to resolve the FL040 error and correctly define your table parameters in SAP.