How To Fix FL373 - All parameters require a reference field or a type

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 373

• Message text: All parameters require a reference field or a type

What causes this issue?

You have defined a parameter without either reference field or type in
an update function module. This is not supported.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You must assign either a reference field, a reference structure or a
type to each parameter.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FL373 - All parameters require a reference field or a type ?

  The SAP error message FL373 ("All parameters require a reference field or a type") typically occurs in the context of creating or modifying function modules, methods, or other programming constructs in ABAP (Advanced Business Application Programming). This error indicates that the parameters defined in the function module or method do not have the necessary reference fields or types associated with them.
  Cause:
  
  Missing Reference Field: The parameters defined in the function module or method do not have a reference to a data element or structure.
  Incorrect Parameter Definition: The parameters may be defined incorrectly, such as using an unsupported data type or not specifying a reference type.
  Inconsistent Data Types: The data types used for the parameters may not be compatible with the expected types in the context of the function or method.
  
  Solution:
  
  
  Check Parameter Definitions: Review the parameter definitions in the function module or method. Ensure that each parameter has a valid reference field or type.
  
  For example, if you are defining a parameter as a structure, ensure that the structure is correctly defined and exists in the system.
  
  
  
  Use Data Elements or Structures: Instead of using primitive data types (like CHAR, NUMC, etc.), consider using data elements or structures that provide a reference.
  
  For instance, if you are passing a string, use a data element that is defined in the Data Dictionary.
  
  
  
  Correct Data Types: Ensure that the data types used for the parameters are compatible with the expected types. If you are using custom types, make sure they are defined correctly in the ABAP Dictionary.
  
  
  Check for Syntax Errors: Sometimes, syntax errors in the code can lead to misleading error messages. Ensure that the code is syntactically correct.
  
  
  Refer to Documentation: If you are unsure about the correct types or structures to use, refer to the SAP documentation or the ABAP programming guidelines.
  
  
  Related Information:
  
  ABAP Data Dictionary: Familiarize yourself with the Data Dictionary (SE11) in SAP, where you can define and manage data elements, domains, tables, and structures.
  Function Module Creation: When creating function modules (SE37), ensure that you follow the guidelines for parameter definitions.
  ABAP Programming Guidelines: Review the ABAP programming guidelines for best practices in defining parameters and data types.
  
  If you continue to encounter issues after checking these aspects, consider seeking assistance from a colleague or consulting SAP support for more specific guidance related to your implementation.