How To Fix CMT2138 - Call up of methods from subscreen not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: CMT2 - Add-On Version: Message Class in CM Environment

• Message number: 138

• Message text: Call up of methods from subscreen not allowed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CMT2138 - Call up of methods from subscreen not allowed ?

  The SAP error message CMT2138, which states "Call up of methods from subscreen not allowed," typically occurs in the context of ABAP programming when there is an attempt to call a method from a subscreen that is not permitted. This can happen in various scenarios, particularly when dealing with custom screens or enhancements in SAP.
  Cause:
  
  Subscreen Context: The error arises when a method is called from a subscreen context where it is not allowed. In SAP, certain methods can only be called from the main screen or specific contexts.
  Incorrect Screen Flow Logic: The screen flow logic may be incorrectly set up, leading to an attempt to invoke methods that are not designed to be called from subscreens.
  Enhancements or Modifications: If there are custom enhancements or modifications in the program, they might inadvertently lead to this error by trying to access methods inappropriately.
  
  Solution:
  
  Review Method Calls: Check the code where the method is being called from the subscreen. Ensure that the method is intended to be called from that context. If not, consider moving the call to the main screen or another appropriate context.
  Adjust Screen Flow: If the screen flow logic is incorrect, adjust it to ensure that method calls are made from the correct screen or context.
  Use Function Modules: If the functionality you are trying to achieve can be encapsulated in a function module, consider using that instead of calling a method directly from the subscreen.
  Debugging: Use the ABAP debugger to trace the execution flow and identify where the method call is being made. This can help pinpoint the exact location and context of the error.
  Consult Documentation: Review SAP documentation or notes related to the specific method or screen you are working with to understand the limitations and proper usage.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide guidance on best practices for screen programming.
  ABAP Programming Guidelines: Familiarize yourself with ABAP programming guidelines regarding screen handling and method calls to avoid similar issues in the future.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, providing insights or solutions from other developers.
  
  By following these steps, you should be able to resolve the CMT2138 error and ensure that your method calls are appropriately structured within the SAP application.