How To Fix C1188 - The data type already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: C1 - Characteristics maintenance messages

• Message number: 188

• Message text: The data type already exists

What causes this issue?

You entered a user-defined data type that already exists and chose the
function for creating a type.

System Response

Your entry is ignored.

How to fix this error?

If you want to create a data type, choose a description that has not
yet been assigned. If you want to process the data type you entered,
select it from the list of existing data types and choose "Display",
"Change", or "Delete".

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C1188 - The data type already exists ?

  The SAP error message C1188, "The data type already exists," typically occurs when you are trying to create a new data type in the ABAP Dictionary (SE11) that has the same name as an existing data type. This can happen in various scenarios, such as when defining a new structure, domain, or data element.
  Cause:
  
  Duplicate Name: You are attempting to create a data type with a name that is already in use in the system.
  Namespace Conflicts: If you are working in a custom namespace, there might be a conflict with standard SAP data types or other custom types.
  Transport Issues: Sometimes, if you are transporting objects between systems, there might be a conflict if the same data type exists in both systems.
  
  Solution:
  
  
  Check Existing Data Types: Before creating a new data type, check the existing data types in the ABAP Dictionary (SE11) to ensure that the name you want to use is not already taken.
  
  Use the "Data Type" option in SE11 and search for the name you intend to use.
  
  
  
  Rename or Modify: If the data type already exists and you need to create a new one, consider renaming your new data type to something unique.
  
  
  Use a Different Namespace: If you are working in a custom development environment, ensure that you are using a unique namespace to avoid conflicts with standard SAP objects.
  
  
  Transport Management: If the issue arises during a transport, check the transport logs and ensure that the data types are correctly managed in both the source and target systems.
  
  
  Consult Documentation: If you are unsure about the existing data types, refer to SAP documentation or consult with your SAP Basis or ABAP team for guidance.
  
  
  Related Information:
  
  Transaction Codes: SE11 (ABAP Dictionary), SE80 (Object Navigator), SE37 (Function Builder).
  Data Dictionary Objects: Understand the different types of objects in the ABAP Dictionary, such as data elements, domains, structures, and tables.
  Naming Conventions: Familiarize yourself with SAP's naming conventions and best practices for creating custom objects to avoid conflicts.
  
  By following these steps, you should be able to resolve the C1188 error and successfully create your desired data type in SAP.