How To Fix E2408 - Alias is not permitted for this table type

SAP Error Message - Details

• Message type: E = Error

• Message class: E2 - DE Data Dictionary

• Message number: 408

• Message text: Alias is not permitted for this table type

What causes this issue?

An alias for the primary key is not permitted for the type definition
under consideration.
INCLUDE DDDOC_TTYP_ALIAS OBJECT DOKU ID TX

System Response

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

How to fix this error?

Delete the alias name or check whether the rule above has been broken
and correct the type definition correspondingly.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E2408 - Alias is not permitted for this table type ?

  The SAP error message E2408, which states "Alias is not permitted for this table type," typically occurs when you are trying to use an alias for a table type in a context where it is not allowed. This can happen in various scenarios, such as when working with ABAP programs, database views, or other data manipulation contexts.
  Cause:
  
  Table Type Restrictions: In ABAP, certain table types (like standard tables, sorted tables, or hashed tables) have specific rules regarding the use of aliases. The error indicates that the operation you are trying to perform is not compatible with the table type you are using.
  Incorrect Syntax: The syntax used to define or reference the table type may be incorrect, leading to the system not recognizing the alias.
  Contextual Limitations: Some contexts, such as certain SQL operations or function modules, may not support the use of aliases for specific table types.
  
  Solution:
  
  Check Table Type: Review the table type you are using and ensure that it supports the use of aliases. If it does not, consider using a different table type that allows for aliases.
  Correct Syntax: Ensure that the syntax you are using to define or reference the table type is correct. Refer to the ABAP documentation for the correct usage of table types and aliases.
  Remove Alias: If the alias is not necessary for your operation, consider removing it and using the table type directly.
  Use Alternative Approaches: If you need to reference the table in a way that requires an alias, consider restructuring your code or using a different approach that does not involve the restricted table type.
  
  Related Information:
  
  ABAP Documentation: Review the official SAP ABAP documentation for detailed information on table types and their restrictions.
  SAP Community: Check forums and community discussions for similar issues and solutions shared by other SAP users.
  Debugging: Use the ABAP debugger to trace the execution of your program and identify where the error occurs, which can help in understanding the context of the error.
  
  If you continue to face issues, consider reaching out to your SAP support team or consulting with an experienced ABAP developer for further assistance.