How To Fix DAAG_DESIGNTIME321 - Number of key fields for table &1 set to maximum possible number

SAP Error Message - Details

• Message type: E = Error

• Message class: DAAG_DESIGNTIME - Message Class for Data Aging Design Time

• Message number: 321

• Message text: Number of key fields for table &1 set to maximum possible number

What causes this issue?

You have left the <LS>Number of Used Key Fields</> field empty or
entered the value '<LB>0</>'. Neither of these entries are permitted.

System Response

The system has changed the value. All of the &V2& key fields (maximum
number) of table &V1& are used.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

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 DAAG_DESIGNTIME321 - Number of key fields for table &1 set to maximum possible number ?

  The SAP error message DAAG_DESIGNTIME321 indicates that the number of key fields for a database table has reached the maximum limit allowed by the SAP system. This limit is typically set to 16 key fields for a table in the ABAP Dictionary.
  Cause:
  The error occurs when you attempt to define or modify a database table in such a way that the number of key fields exceeds the maximum limit. This can happen during the creation of a new table or when trying to add additional key fields to an existing table.
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Review Key Fields: Check the existing key fields of the table and determine if all of them are necessary. If some key fields are not essential for the table's functionality, consider removing them.
  
  
  Composite Keys: If you have multiple fields that are being used as keys, consider whether you can combine some of them into a composite key. This can help reduce the total number of key fields.
  
  
  Normalization: Evaluate the table design for normalization opportunities. Sometimes, splitting a table into multiple related tables can help reduce the number of key fields in a single table.
  
  
  Reassess Requirements: Reassess the business requirements to see if all the key fields are truly needed. Sometimes, business processes can be adjusted to work with fewer key fields.
  
  
  Consult Documentation: Refer to SAP documentation or consult with your SAP Basis or ABAP team for best practices regarding table design and key field usage.
  
  
  Related Information:
  
  Maximum Key Fields: The maximum number of key fields for a table in SAP is generally 16. This is a hard limit imposed by the database structure.
  Performance Considerations: Having too many key fields can impact performance, as it may complicate indexing and data retrieval processes.
  ABAP Dictionary: The ABAP Dictionary (SE11) is the tool used to create and manage database tables, including defining key fields.
  
  If you continue to face issues or if the design changes are complex, it may be beneficial to engage with an SAP consultant or a technical team member who specializes in database design within SAP.