How To Fix BO020 - Function module & was called up incorrectly

SAP Error Message - Details

• Message type: E = Error

• Message class: BO - General object number

• Message number: 020

• Message text: Function module & was called up incorrectly

What causes this issue?

Function module &V1& was called incorrectly.

System Response

The system canceled processing.

How to fix this error?

Check the call for function module &V1& in your program. Compare the
call with the documentation on function module &V1& (including the
comments in the source code). Find out where requirements for the call
were infringed and make the appropriate changes to your program.
A call is disallowed if, for example, there is a restriction on the
number of entries in a passed table and the table contains more entries
when the call is made.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BO020 - Function module & was called up incorrectly ?

  The SAP error message BO020, which states "Function module & was called up incorrectly," typically indicates that there is an issue with how a function module is being invoked in your SAP system. This error can arise from various causes, and understanding these can help in troubleshooting and resolving the issue.
  Causes of BO020 Error
  
  
  Incorrect Parameters: The function module may have been called with incorrect or missing parameters. Each function module has a specific interface that defines the expected input and output parameters.
  
  
  Data Type Mismatch: If the data types of the parameters being passed do not match the expected data types defined in the function module, this error can occur.
  
  
  Improper Sequence of Calls: Some function modules may require that certain other function modules be called first, or that they be called in a specific sequence.
  
  
  Authorization Issues: If the user does not have the necessary authorizations to execute the function module, it may lead to this error.
  
  
  Configuration Issues: There may be configuration settings in the system that are not set up correctly, leading to the function module being called incorrectly.
  
  
  Custom Code Issues: If the function module is being called from custom ABAP code, there may be bugs or logical errors in that code.
  
  
  Solutions to BO020 Error
  
  
  Check Function Module Documentation: Review the documentation for the function module to ensure that you are passing the correct parameters and that they are in the correct format.
  
  
  Debugging: Use the ABAP debugger to step through the code where the function module is being called. This can help identify what parameters are being passed and whether they are correct.
  
  
  Review Custom Code: If the function module is being called from custom code, review that code for any logical errors or incorrect parameter handling.
  
  
  Check Authorizations: Ensure that the user executing the function module has the necessary authorizations. You can check this in transaction SU53 after the error occurs.
  
  
  Consult SAP Notes: Search the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide guidance on the function module in question.
  
  
  Testing in a Development Environment: If possible, replicate the issue in a development or test environment to isolate the problem without affecting production.
  
  
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP Support for assistance.
  
  
  Related Information
  
  Transaction Codes: You may want to use transaction codes like SE37 (Function Builder) to examine the function module and its parameters.
  ABAP Development: Familiarity with ABAP programming can be beneficial for troubleshooting this error, especially if custom code is involved.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the BO020 error and implement a suitable solution.