How To Fix ED128 - Module cannot be modified or cursor wrongly positioned

SAP Error Message - Details

• Message type: E = Error

• Message class: ED - ABAP/4 Editor messages

• Message number: 128

• Message text: Module cannot be modified or cursor wrongly positioned

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ED128 - Module cannot be modified or cursor wrongly positioned ?

  The SAP error message ED128, which states "Module cannot be modified or cursor wrongly positioned," typically occurs in the context of ABAP programming or when working with SAP's screen painter or module pool programming. This error indicates that there is an issue with the way the program is trying to modify a screen or a module, often due to the cursor being in an incorrect position or the module being in a state that does not allow modifications.
  Causes:
  
  
  Cursor Positioning: The cursor may not be positioned correctly on the screen or in the module where the modification is attempted. This can happen if the program logic does not properly control the flow of the screen or if the user interface is not in the expected state.
  
  
  Screen Attributes: The screen or module may be set to a mode that does not allow modifications (e.g., display mode instead of change mode).
  
  
  Program Logic Errors: There may be logical errors in the ABAP code that lead to attempts to modify a module that is not currently active or is not in a modifiable state.
  
  
  Field Attributes: The fields being modified may have attributes that prevent changes, such as being set as read-only.
  
  
  Solutions:
  
  
  Check Cursor Position: Ensure that the cursor is positioned correctly on the screen or module where the modification is intended. You can use debugging tools to trace the cursor's position and ensure it is in the right place.
  
  
  Review Screen Attributes: Verify the attributes of the screen or module. Make sure that it is in a mode that allows modifications. If it is in display mode, switch to change mode before attempting to modify.
  
  
  Debugging: Use the ABAP debugger to step through the code and identify where the error occurs. Look for any logical errors that may lead to the cursor being in the wrong position or the module being in an incorrect state.
  
  
  Field Properties: Check the properties of the fields being modified. Ensure that they are not set to read-only or have other attributes that prevent modification.
  
  
  Code Review: Review the ABAP code for any potential issues that could lead to this error. Look for any conditions that might prevent the module from being modified.
  
  
  User Interface Logic: Ensure that the user interface logic is correctly implemented, and that the program flow allows for the necessary modifications to occur.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE80 (Object Navigator) and SE38 (ABAP Editor) for debugging and reviewing the code.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Review SAP documentation on screen programming and module pool development for best practices and guidelines.
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an experienced ABAP developer for further assistance.