How To Fix AQ150 - The field & has already been assigned to table &

SAP Error Message - Details

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 150

• Message text: The field & has already been assigned to table &

What causes this issue?

You attempted to maintain an additional field, which has already been
defined, but chose a different assignment to a logical database table
than that in the original definition of the additional field.

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?

If you want to change the additional field definition without changing
the database table assignment, specify the correct database table.
If you want to assign the additional field to a different database
table, you must first delete the additional field en then redefine it.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AQ150 - The field & has already been assigned to table & ?

  The SAP error message AQ150, which states "The field & has already been assigned to table &," typically occurs during the process of defining or modifying database tables or structures in the Data Dictionary (SE11) or when working with ABAP Dictionary objects. This error indicates that the field you are trying to assign to a table is already associated with another table or structure.
  Cause:
  
  Field Already Assigned: The field you are trying to add to a table is already defined in another table or structure. In SAP, fields must be unique within the context of a table or structure.
  Duplicate Definition: There may be an attempt to create a duplicate field definition in the Data Dictionary.
  Incorrect Table/Field Reference: The field might be referenced incorrectly, leading to confusion in the assignment.
  
  Solution:
  
  Check Field Assignment: Verify if the field is already assigned to another table or structure. You can do this by checking the Data Dictionary (SE11) for the field's definition.
  Use a Different Field: If the field is already in use, consider using a different field or creating a new field that meets your requirements.
  Modify Existing Table: If you need to use the same field, consider modifying the existing table or structure where the field is already defined, rather than trying to assign it to a new one.
  Review Data Dictionary: Ensure that you are not trying to create a duplicate field definition. If you need to use the same field in multiple places, you can reference it instead of redefining it.
  Check for Dependencies: If the field is part of a structure or a domain, ensure that you are not violating any dependencies or constraints.
  
  Related Information:
  
  Transaction Codes: Use SE11 (Data Dictionary) to view and manage tables and fields.
  Field Types: Understand the types of fields (e.g., data elements, domains) and how they can be reused across different tables.
  Documentation: Refer to SAP documentation or help resources for more detailed information on Data Dictionary management and field assignments.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message.
  
  By following these steps, you should be able to resolve the AQ150 error and successfully manage your table and field assignments in SAP.