How To Fix AQ635 - Table name is already being used as an alias

SAP Error Message - Details

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 635

• Message text: Table name is already being used as an alias

What causes this issue?

You have tried to include a table in the join. There is already a
table with an identical <ZH>Alias</>.

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?

Continue with the entry and assign another alias to the table.
If you still can, it is recommended that you change the alias of the
other table to avoid any possibility of confusion.

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 AQ635 - Table name is already being used as an alias ?

  The SAP error message AQ635, which states "Table name is already being used as an alias," typically occurs when there is an attempt to create an alias for a database table that has already been defined in the current context. This can happen in various scenarios, such as when working with database views, ABAP programs, or SQL queries.
  Cause:
  
  Duplicate Alias Definition: The most common cause is that the alias name you are trying to create is already in use for another table or view in the same context.
  Scope Issues: If you are working within a specific scope (like a function module or a method), the alias might already be defined in that scope.
  Incorrect SQL Syntax: Sometimes, the error can arise from incorrect SQL syntax that leads to confusion in aliasing.
  
  Solution:
  
  Check Existing Aliases: Review the existing aliases in your program or SQL statement to ensure that the alias you are trying to create is not already defined.
  Rename the Alias: If the alias is already in use, consider renaming it to something unique that does not conflict with existing aliases.
  Review SQL Statements: If you are using SQL statements, ensure that your syntax is correct and that you are not unintentionally creating duplicate aliases.
  Clear Cache: In some cases, clearing the cache or refreshing the session may help if the alias is being held in memory.
  Debugging: If you are unable to find the source of the issue, use debugging tools to step through the code and identify where the alias is being defined.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on database table aliases and their usage.
  ABAP Development: If you are working in ABAP, familiarize yourself with the rules regarding table aliases and how they are defined in your programs.
  Database Views: If you are working with database views, ensure that the view definitions do not conflict with your alias definitions.
  Community Forums: Check SAP community forums or support channels for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to resolve the AQ635 error and successfully manage your table aliases in SAP.