How To Fix DT803 - Field & applied as a non-key field in table &

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 803

• Message text: Field & applied as a non-key field in table &

What causes this issue?

In the old version, the field was a key field of the table. In the new
version, the field is a non-key field.

System Response

The table is activated with the field as non-key field.
Foreign key relationships in which the table occurs as a check field
are modified or possibly even deleted.

How to fix this error?

There is a danger that data may be lost (if two records in the database
are distinguished by no other key field). If you wish to prevent this
happening, you must save this data in an additional backup table.
It may be necessary to revise foreign key relationships in which the
table is used as a check table.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT803 - Field & applied as a non-key field in table & ?

  The SAP error message DT803 indicates that a field is being used as a non-key field in a table where it is expected to be a key field. This typically occurs during the definition of database tables in the Data Dictionary (SE11) or when trying to activate a table that has been defined incorrectly.
  Cause:
  
  Field Definition: The field in question is defined as a non-key field in a table that is expected to have it as a key field. This can happen if the field is used in a primary key or unique index but is not marked as such in the table definition.
  Table Structure: The structure of the table may not align with the requirements of the application or the data model, leading to inconsistencies.
  Data Model Changes: If there have been recent changes to the data model or the table structure, it may lead to this error if the changes are not properly reflected in the table definition.
  
  Solution:
  
  Check Field Definition: Go to transaction SE11 and check the definition of the table. Ensure that the field in question is correctly defined as a key field if it is supposed to be one.
  Adjust Table Structure: If the field should be a key field, modify the table structure to include it as a key field. If it should not be a key field, ensure that it is not being used in any key constraints or indexes.
  Activate the Table: After making the necessary changes, try to activate the table again. This should resolve the error if the definitions are now consistent.
  Review Related Objects: Check any related objects (like views, indexes, or foreign key relationships) that might reference the table and ensure they are also consistent with the changes made.
  
  Related Information:
  
  Transaction Codes: SE11 (Data Dictionary), SE14 (Database Utility), SE80 (Object Navigator).
  Documentation: Refer to SAP Help documentation for guidelines on defining tables and fields in the Data Dictionary.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message or provide additional context.
  
  If the problem persists after following these steps, it may be beneficial to consult with a technical SAP consultant or check SAP community forums for similar issues and solutions.