How To Fix SV520 - Master program of the user exits must not be of type &.

SV520 - Overview

• Message type: E = Error

• Message class: SV - View Maintenance: Customize Messages

• Message number: 520

• Message text: Master program of the user exits must not be of type &.

What causes this issue?

The program you specified is of type &V1&. This program type is not
supported as a master program for the FORM Routines of your user exits.

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?

Create your form routines in a program of type 'M' (module pool), 'S'
(subroutine pool), or '1' (online program). You can not define your form
routines in a function group (type 'F'), since the access mechanism
performed on the global data in view cluster maintenance is not
supported in this case.
Note:
Include the INCLUDE statement INCLUDE LSVCMCOD in your program to have
access to the global data in view cluster maintenance.

Error message extract from SAP system. Copyright SAP SE.

SV520 - Details

• The SAP error message SV520 indicates that there is an issue with the user exit implementation in your SAP system. Specifically, it means that the master program of the user exits is of an incorrect type. This typically occurs when the user exit is not defined correctly or is not compatible with the expected program type.
  
  Cause:
  
  Incorrect Program Type: The user exit is defined in a program that is not of the expected type (e.g., it might be a report program instead of a function module).
  
  Configuration Issues: There may be configuration issues in the user exit settings or the way the user exit is being called.
  Missing or Incorrect Implementation: The user exit may not be implemented correctly, or the necessary code may be missing.
  
  
  Solution:
  
  Check User Exit Definition: Verify the definition of the user exit in the SAP system. Ensure that it is defined in the correct program type.
  Review Implementation: Go through