How To Fix MN397 - Function & not defined in "select block" mode

SAP Error Message - Details

• Message type: E = Error

• Message class: MN - Message class for subsequent settlement (Purchasing)

• Message number: 397

• Message text: Function & not defined in "select block" mode

What causes this issue?

Within the framework of interactive reporting, you have requested
function &V1&. However, this has not been defined or is not allowed in
"Select block" mode.

System Response

Function &V1& could not be performed.

How to fix this error?

If you did not request function &V1& through manual input, this message
is due to a program error. If necessary, contact your system
administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MN397 - Function & not defined in "select block" mode ?

  The SAP error message MN397, which states "Function & not defined in 'select block' mode," typically occurs when there is an issue with the way a function module or a method is being called within a select block in an ABAP program. This error indicates that the function you are trying to use is not allowed in the context of a select block.
  Cause:
  
  Function Module Restrictions: Certain function modules or methods cannot be called within a select block due to restrictions in the ABAP language. This is often the case for functions that perform database operations or that are not designed to be executed in a select block context.
  Incorrect Syntax: The syntax used to call the function may be incorrect or not compatible with the select block.
  Contextual Limitations: The function may require a different context or may need to be executed outside of the select block.
  
  Solution:
  
  
  Move Function Call Outside of Select Block: If the function is not allowed within the select block, you should refactor your code to call the function after the select statement has been executed. For example, you can store the results of the select statement in an internal table and then process that data with the function outside of the select block.
  SELECT * FROM your_table INTO TABLE @DATA(result).
  LOOP AT result INTO DATA(row).
      CALL FUNCTION 'your_function' EXPORTING your_parameter = row-field.
  ENDLOOP.
  
  
  Check Function Documentation: Review the documentation for the function module or method you are trying to use. Ensure that it is intended to be used in the way you are attempting.
  
  
  Use Alternative Approaches: If the function is not suitable for your needs, consider using alternative methods or functions that can achieve the same result without violating the select block restrictions.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for ABAP programming to understand the rules and restrictions regarding select blocks and function calls.
  SAP Community: Engage with the SAP Community forums or other developer resources to find similar issues and solutions shared by other developers.
  Debugging: Use the ABAP debugger to step through your code and identify where the error occurs, which can help you understand the context better.
  
  By following these steps, you should be able to resolve the MN397 error and successfully execute your ABAP program.