How To Fix SGSUB012 - &1 is already reserved as a predefined type

SAP Error Message - Details

• Message type: E = Error

• Message class: SGSUB - Central Storage for Data Types and BAdIs

• Message number: 012

• Message text: &1 is already reserved as a predefined type

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.

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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SGSUB012 - &1 is already reserved as a predefined type ?

  The SAP error message SGSUB012 indicates that a specific name or identifier you are trying to use is already reserved as a predefined type in the SAP system. This typically occurs when you are attempting to create a new data type, structure, or other object using a name that conflicts with existing predefined types or reserved keywords in SAP.
  Cause:
  
  Name Conflict: The name you are trying to use is already taken by a predefined type in the SAP system.
  Reserved Keywords: You may be using a name that is reserved by SAP for internal use or for specific functionalities.
  
  Solution:
  
  Choose a Different Name: The simplest solution is to rename the object you are trying to create. Ensure that the new name does not conflict with existing predefined types or reserved keywords.
  Check Naming Conventions: Follow SAP's naming conventions for custom objects. Typically, custom objects should start with a specific prefix (like Z or Y) to avoid conflicts with standard SAP objects.
  Use Transaction Codes: You can use transaction codes like SE11 (Data Dictionary) to check existing types and ensure that your chosen name is not already in use.
  Documentation: Refer to SAP documentation or the ABAP Dictionary to understand the reserved names and types.
  
  Related Information:
  
  SAP Naming Conventions: Familiarize yourself with SAP's naming conventions to avoid such conflicts in the future.
  ABAP Dictionary: Use the ABAP Dictionary (SE11) to explore existing data types and structures.
  SAP Notes: Check SAP Notes for any updates or specific guidance related to this error message.
  Community Forums: Engage with SAP community forums or support channels for additional insights and solutions from other users who may have encountered the same issue.
  
  By following these steps, you should be able to resolve the SGSUB012 error and successfully create your desired object in SAP.