How To Fix DT820 - & occurs as & in the non-key section of the table

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 820

• Message text: & occurs as & in the non-key section of the table

What causes this issue?

In the customer version of the table, the include is located in the key
section. In the SAP version, on the other hand, it is in the non-key
section.

System Response

The include is transferred to the non-key section of the table.

How to fix this error?

Reducing the key in this way carries the risk of table entries being
lost. However, if the field in question is converted back to the key
field, there is a danger that SAP applications will no longer work or
will not function correctly.
If the field in question is the check field of a foreign key
relationship, this will be deleted.
Check the situation carefully and, if necessary, modify the table.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT820 - & occurs as & in the non-key section of the table ?

  The SAP error message DT820 typically indicates an issue related to the data dictionary, specifically concerning the definition of a table or structure in the ABAP Dictionary. The error message usually states that there is a problem with the non-key fields of a table, which can occur for various reasons.
  Cause of Error DT820
  
  Field Definition Issues: The non-key fields in the table may not be defined correctly. This could include incorrect data types, lengths, or other attributes that do not conform to the expected standards.
  Inconsistent Data Types: If the non-key fields are defined with inconsistent data types or lengths compared to other related tables or structures, this error can occur.
  Missing Field Attributes: Required attributes for non-key fields may be missing, such as field labels or documentation.
  Table Locking Issues: Sometimes, if the table is locked or being modified by another user or process, it can lead to this error.
  
  Solution
  
  Check Field Definitions: Review the definitions of the non-key fields in the table. Ensure that all fields are defined with the correct data types, lengths, and attributes.
  Consistency Check: Ensure that the non-key fields are consistent with other related tables or structures. If there are discrepancies, correct them.
  Field Attributes: Make sure that all required attributes for the non-key fields are properly set. This includes labels, documentation, and any other necessary metadata.
  Transport Requests: If the error occurs after a transport request, check if the transport was successful and if all objects were correctly imported.
  Table Activation: If you have made changes to the table structure, ensure that the table is activated. You can do this by going to the Data Dictionary (SE11) and activating the table.
  Check for Locks: Use transaction SM12 to check for any locks on the table. If there are locks, you may need to wait for them to be released or contact the user who has locked the table.
  
  Related Information
  
  Transaction Codes: You can use transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), and SE37 (Function Module) to investigate and resolve issues related to table definitions.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address specific issues related to error DT820.
  Documentation: Review the SAP documentation for guidelines on defining tables and structures in the ABAP Dictionary.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis or ABAP development team for further assistance.