How To Fix DT271 - Field &: Component type of a DB table may not be table type

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 271

• Message text: Field &: Component type of a DB table may not be table type

What causes this issue?

You want to use the component type as table type in the specified field
of the database table. This is not allowed for database tables.

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?

Remove the character for the table type attribute from the specified
field.

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 DT271 - Field &: Component type of a DB table may not be table type ?

  The SAP error message DT271 indicates that there is an issue with the definition of a database table in the Data Dictionary (DDIC). Specifically, the error states that a field in a database table is defined with a component type that is not allowed, particularly that it cannot be of a table type.
  Cause:
  The error typically arises when:
  
  A field in a database table is incorrectly defined to reference a table type (like a table or internal table) instead of a simple data type (like CHAR, NUMC, etc.).
  The field is trying to use a structure or a table type that is not valid for a database table field.
  
  Solution:
  To resolve the DT271 error, follow these steps:
  
  
  Check Field Definitions:
  
  Go to the Data Dictionary (transaction SE11).
  Open the database table that is causing the error.
  Review the field definitions and ensure that none of the fields are defined with a table type.
  
  
  
  Change Field Type:
  
  If you find a field defined with a table type, change it to a valid data type (e.g., CHAR, NUMC, etc.) or a structure that is appropriate for a database table.
  
  
  
  Activate the Table:
  
  After making the necessary changes, activate the database table. This will ensure that the changes are saved and the table is correctly defined.
  
  
  
  Check Related Structures:
  
  If the field is part of a structure, ensure that the structure itself does not contain any table types as fields.
  
  
  
  Recheck Dependencies:
  
  If the table is used in other objects (like views, programs, etc.), ensure that those objects are also updated if necessary.
  
  
  
  Related Information:
  
  Data Dictionary (DDIC): The central repository in SAP for all data definitions, including tables, views, data elements, domains, etc.
  Table Types: In SAP, table types are used to define internal tables in ABAP programs, but they cannot be used as fields in database tables.
  Transaction Codes:
  
  SE11: Data Dictionary for creating and modifying database objects.
  SE14: Database Utility for managing database objects.
  
  
  
  By following these steps, you should be able to resolve the DT271 error and ensure that your database table is correctly defined.