How To Fix MODEL020 - Header table '&1' already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: MODEL - Modeling

• Message number: 020

• Message text: Header table '&1' already exists

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MODEL020 - Header table '&1' already exists ?

  The SAP error message MODEL020 indicates that there is an attempt to create a header table that already exists in the system. This typically occurs when you are trying to create a new data model or a new table in the SAP system, but the system detects that a table with the same name already exists.
  Cause:
  
  Duplicate Table Creation: The most common cause is that the table you are trying to create has already been defined in the system.
  Incorrect Naming: You might be using a name that is already in use by another table or object in the SAP system.
  Transport Issues: If you are working in a development environment and have transported objects to a different environment, there might be a conflict with existing objects.
  
  Solution:
  
  Check Existing Tables: Before creating a new table, check if the table already exists. You can do this by using transaction codes like SE11 (Data Dictionary) to search for the table name.
  Use a Different Name: If the table already exists and you need to create a new one, consider using a different name that does not conflict with existing objects.
  Modify Existing Table: If the table already exists and you need to make changes, consider modifying the existing table instead of creating a new one.
  Transport Management: If this issue arises due to transport, ensure that the transport requests are correctly managed and that there are no conflicts with existing objects in the target environment.
  
  Related Information:
  
  Transaction Codes: 
  
  SE11: Data Dictionary - to check existing tables.
  SE14: Database Utility - to manage database objects.
  
  
  Naming Conventions: Familiarize yourself with SAP naming conventions to avoid conflicts.
  Documentation: Refer to SAP documentation for guidelines on creating and managing database tables.
  SAP Notes: Check SAP Notes for any specific issues related to your version of SAP that might provide additional insights or solutions.
  
  If the problem persists after checking these aspects, consider reaching out to your SAP Basis or development team for further assistance.