How To Fix DT266 - Type of key field & is a table type

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 266

• Message text: Type of key field & is a table type

What causes this issue?

You assigned the attribute 'key field' to a structure field whose type
is a table type. The runtime environment cannot handle this, so that it
is not activated.

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 attribute 'key field' from the corresponding field and check
or activate the structure again.

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 DT266 - Type of key field & is a table type ?

  The SAP error message DT266 typically indicates that there is an issue with the definition of a key field in a table type. This error can occur in various contexts, such as when defining a table type in ABAP or when working with data structures that involve table types.
  Cause:
  The error message DT266 is triggered when:
  
  A key field is defined in a table type, but it is not allowed to be a key field due to the nature of the table type.
  The table type is defined incorrectly, possibly due to a mismatch in the data structure or incorrect attributes assigned to the fields.
  
  Solution:
  To resolve the DT266 error, you can take the following steps:
  
  
  Check Table Type Definition:
  
  Review the definition of the table type in the Data Dictionary (SE11).
  Ensure that the key fields are defined correctly and that they are appropriate for the table type you are using.
  
  
  
  Modify Key Fields:
  
  If the table type is not intended to have key fields, remove the key field definitions.
  If key fields are necessary, consider using a different type of data structure that supports key fields, such as a transparent table or a structure.
  
  
  
  Review Data Structure:
  
  Ensure that the data structure you are working with is compatible with the operations you are trying to perform.
  Check for any inconsistencies in the data types or attributes of the fields.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for guidance on defining table types and key fields.
  
  
  
  Testing:
  
  After making changes, test the table type to ensure that the error is resolved and that it behaves as expected.
  
  
  
  Related Information:
  
  Table Types: In SAP ABAP, table types are used to define internal tables. They can be defined with or without key fields, depending on the requirements.
  Key Fields: Key fields are used to uniquely identify records in a table. In the context of internal tables, they are important for operations like sorting and searching.
  Data Dictionary (SE11): This is the transaction code used to access the Data Dictionary in SAP, where you can create and modify database objects, including table types.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP support team or consulting with an experienced ABAP developer for further assistance.